Blended families are now one of the most common family structures in California. They also bring estate-planning questions that a first marriage never raises. The deepest worry most remarried parents carry is quiet but real.
Here is that worry, stated plainly. After you are gone, your surviving spouse could steer assets away from your children from a prior relationship. Not out of malice, usually, but because the plan allowed it. The good news is that the right structure prevents this.
A well-built trust can provide for your spouse for life and still lock in your children as the beneficiaries who inherit what remains. With an LL.M. in Taxation and 20 years guiding San Diego County families, I will walk you through the structures that balance both. I will also explain the trade-offs that decide which one fits.
Key Takeaways
- In California, a basic “all to my spouse” plan can let a surviving spouse later redirect assets away from your children from a prior marriage.
- Three trust structures solve this: the A-B trust, the QTIP trust, and separate trusts. Each provides for the spouse while locking in the children’s share.
- Under the One Big Beautiful Bill Act (OBBBA), the federal estate tax exemption is $15 million per person for 2026, a figure OBBBA made permanent in the sense that there is no scheduled sunset, though a future Congress could change it. A married couple can shelter up to $30 million combined, but only with a portability election or credit shelter (bypass) trust planning, not automatically. For most blended families, the reason to use these trusts is control, not tax.
- A QTIP trust often fits non-taxable California families best, because it locks the remainder for your children and preserves a second step-up in basis.
- California has no state estate tax, so blended-family planning here centers on fairness and control, not a death tax.
1. Why Estate Planning Is Critical for Blended Families
A blended family forms when one or both spouses bring children from a prior relationship into a new marriage. That structure creates competing loyalties no estate plan can ignore. You love your spouse. You also have children whose inheritance you want to protect.
A solid plan does four things at once. It distributes assets fairly. It provides for your surviving spouse. It prevents disputes between your spouse and your children. And it makes guardianship clear if minor children are involved.
California Community Property Changes the Math
California is a community property state. Your new spouse generally owns half of everything the two of you acquire during the marriage, no matter what you intend for your kids. Separate property, such as assets you owned before marriage or an inheritance you received, keeps its separate character only if you do not commingle it.
Commingling happens fast. Deposit your inheritance into a joint account, and it can lose its separate character. That single mistake can quietly fold money you meant for your children into the marital estate.
What Happens If You Have No Plan
Without a plan, California intestate succession decides everything. The surviving spouse takes all community property under Probate Code Section 6401. Your separate property is then split between your spouse and children under Sections 6401(c) and 6402.
Those fixed shares rarely match a blended family’s wishes. Worse, stepchildren you never legally adopted generally inherit nothing under intestacy. California has no state estate tax, so this planning is about control and fairness, not a death tax.
2. Wills and Trusts: The Foundation for Blended Families
Every blended-family plan starts with two tools: a will and a revocable living trust. They do different jobs, and you usually need both.
What Your Will Should Do
A will lets you name beneficiaries, appoint an executor, and nominate a guardian for minor children. In a blended family, the executor choice matters more than usual. Naming a neutral, organized executor reduces the chance of friction between your spouse and your children later.
What a Revocable Living Trust Adds
A California revocable living trust avoids probate, keeps your affairs private, and lets you control the timing of distributions. For most California homeowners, that probate avoidance alone justifies the trust.
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The limitation that drives the next step Here is what many people miss. A basic joint revocable living trust, on its own, often does not fully protect a blended family. After the first spouse dies, the survivor can typically amend their share. They can redirect it to anyone, including a new partner or only their own children. Solving that requires a structure that locks in the children’s share. That is what the next section covers. |
3. The Trust Structures That Protect Both Your Spouse and Your Children
Three main structures let a California blended family provide for a surviving spouse while securing the children’s right to the remainder. They differ in how tightly they lock the children’s share and in how they handle the step-up in basis. The right one depends on your assets and your goals.
A-B Trust vs QTIP Trust vs Separate Trusts at a Glance
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Feature |
A-B Trust (bypass) |
QTIP Trust |
Separate Trusts |
|
Provides for surviving spouse |
Yes (income, often limited principal) |
Yes (all income for life) |
Yes (each spouse’s own plan) |
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Children’s remainder locked in |
Yes (B trust is irrevocable) |
Yes (survivor cannot change it) |
Yes (each controls their own) |
|
Second step-up at survivor’s death |
No (bypass assets leave the estate) |
Yes (included in survivor’s estate) |
Depends on each trust |
|
Main modern reason to use |
Remainder control, GST, creditor protection |
Remainder control plus preserved step-up |
Clean separation, simplicity |
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Complexity and cost |
Higher |
Moderate to higher |
Higher (two documents) |
|
Best fit |
Larger or GST-motivated estates |
Many non-taxable blended families |
Significant separate property |
The A-B Trust
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What is an A-B trust for a blended family? A California A-B trust splits a married couple’s estate when the first spouse dies. It creates a survivor’s trust (the A trust) and an irrevocable bypass trust (the B trust). The surviving spouse can benefit from the B trust for life but cannot change its beneficiaries. For a California blended family, that locked remainder protects the deceased spouse’s children. |
Here is how it works in plain terms. At the first death, a defined share funds the irrevocable B trust, also called the bypass or decedent’s trust. The survivor usually receives income, and sometimes limited principal for health and support. The remainder, though, is fixed for the deceased spouse’s chosen beneficiaries.
Now for the honest modern framing. A-B trusts were historically driven by estate tax, because the B trust locked in the first spouse’s exemption. Under OBBBA, the federal exemption is $15 million per person for 2026, which the law made permanent in the sense that there is no scheduled sunset, though a future Congress could still change it. A married couple can shelter up to $30 million combined, but only by making a portability election or by using credit shelter (bypass) trust planning; it is not automatic. So for the vast majority of blended families, there is no estate tax to save. You can confirm the federal figures on the IRS estate tax page. The reason to consider an A-B trust today is remainder control, and sometimes GST planning or creditor protection, not tax.
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The step-up trade-off (do not skip this) Assets in the irrevocable B trust do not receive a second step-up in basis when the surviving spouse dies, under IRC Section 1014. So your children may owe more capital gains tax when they sell. For a non-taxable estate, that lost step-up can cost more than the A-B structure saves. That is exactly why a QTIP is often the better fit, which we cover next. |
In our experience working with San Diego County families, we still draft A-B trusts for blended families. We just draft them far less often for taxes than people expect. The modern reason is simple. It fixes the children from a first marriage as the remainder beneficiaries, so the surviving spouse cannot redirect that share to anyone else. For the full mechanics, see our complete guide to California trusts.
The QTIP Trust (Often the Better Fit for Non-Taxable Blended Families)
A California QTIP trust gives your surviving spouse all trust income for life. The remainder then passes to the beneficiaries you chose, usually your children. The survivor cannot redirect that remainder. QTIP stands for qualified terminable interest property.
Here is the tax point that sets it apart. A QTIP qualifies for the unlimited marital deduction under IRC Section 2056(b)(7), provided the deceased spouse’s executor makes the QTIP election. That election causes the trust assets to be included in the survivor’s estate under IRC Section 2044, so they generally receive a second step-up in basis at the survivor’s death. That preserves basis for your children.
One practical point: in a non-taxable estate, capturing that step-up means actually making the QTIP election, which usually requires filing a federal estate tax return for that purpose. For most California blended families who owe no estate tax, a QTIP still offers the cleaner balance of remainder control and step-up.
Separate Trusts (His and Hers)
With separate trusts, each spouse has their own trust controlling their own assets and their own remainder beneficiaries. This approach works well for couples with significant separate property, or for spouses who simply want clean separation. Each of you decides where your share goes, without needing the other’s agreement after death.
One California nuance matters here. Community property does not change character just because you title it inside a separate trust. Keeping that character clean usually requires a proper transmutation agreement, which is a written agreement that changes how the law treats the asset. Without it, the community-property rules still apply.
How to Choose Among Them
There is no single right answer, but the patterns are clear. A QTIP fits many non-taxable blended families who want spouse income plus a locked remainder and a preserved step-up. An A-B trust makes sense when there is a GST goal, a creditor concern, or a genuinely large estate.
Separate trusts win when significant separate property or a preference for simplicity dominates. Many plans combine these tools, such as an A-B-C structure that uses a QTIP marital trust. The choice is individualized, which is why it is worth talking through with a California estate planning attorney.
4. The Intestate Succession Problem (What Happens With No Plan)
Skip planning, and California’s intestacy statutes take over. Under Probate Code Sections 6401 and 6402, the law splits your estate between your spouse and children in fixed shares. Those shares almost never reflect what a blended family wants.
A few examples show the problem. Your spouse takes all community property. Your separate property is divided, with your spouse receiving one-half if you leave one child, or one-third if you leave two or more children. Stepchildren you never adopted generally receive nothing at all. None of this can be tailored to your family once you are gone.
5. Beneficiary Designations and Joint Ownership
Your trust is not the only thing that controls where assets go. Beneficiary designations and how you hold title can override it entirely. In a blended family, this is where plans quietly fall apart.
Think about retirement accounts and life insurance. Many people name a spouse as beneficiary years ago, then never update it after a divorce or remarriage. The beneficiary form wins over your will or trust every time. An out-of-date form can send your 401(k) to an ex-spouse instead of your children.
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Watch joint tenancy with right of survivorship In California, property held in joint tenancy with right of survivorship passes directly to the surviving co-owner. It bypasses your will and your trust completely. Title a home that way with your new spouse, and it can defeat the plan you built for your children. Coordinate your title, your beneficiary forms, and your trust so they all tell the same story. |
6. Guardianship for Minor Children
If you have minor children, naming a guardian is one of the most important choices in your plan. A guardian raises your children if you cannot. Name that person in your will so a California court honors your choice.
Look for shared values, financial stability, and a genuine willingness to serve. Blended families often add a layer of complexity around shared custody. If your children’s other biological parent is living, that parent’s rights usually come first. Naming a guardian still matters, because it speaks for you if no fit parent is available.
If you are building a plan around young children, our guide to estate planning for new parents walks through guardianship, trusts for minors, and the documents every parent should have in place.
7. Healthcare Directives and Powers of Attorney
Estate planning is not only about death. It is also about who speaks for you if you cannot speak for yourself. Two documents handle this: an advance health care directive and a durable power of attorney for finances.
In a blended family, naming the right decision-maker prevents painful conflict during a medical crisis. Without clear documents, your spouse and your adult children may disagree about your care, and a court may have to step in. Choosing your agents in advance keeps that decision in the family, on your terms.
8. Regularly Reviewing and Updating Your Plan
An estate plan is not a one-time project. It is a living set of documents that should track your life. Review yours after any major change.
Remarriage, a new child or grandchild, a big change in assets, or a move all call for a fresh look. Revisit your A-B or QTIP choice too, since both the law and your family keep evolving. A plan that fit five years ago may no longer match where your blended family stands today.
Frequently Asked Questions
A blended family forms when one or both spouses bring children from a prior relationship into a new marriage. It often includes stepchildren, half-siblings, and children from more than one parent. These families face estate-planning questions a first marriage never raises.
Use a trust structure that locks in their share. A QTIP trust or an A-B trust gives your surviving spouse support for life, then directs the remainder to your children. The survivor cannot redirect that remainder. A plain “all to my spouse” plan does not offer this protection.
An A-B trust splits a married couple’s estate at the first death into a survivor’s trust (A) and an irrevocable bypass trust (B). The surviving spouse benefits from the B trust but cannot change its beneficiaries, so your children are locked in as the remainder. Historically, A-B trusts saved estate tax. Today, with a $15 million per person federal exemption that OBBBA made permanent, most blended families use them for control, not tax. One caveat: B trust assets miss a second step-up in basis. Many families compare an A-B structure against a QTIP before deciding.
It depends on the estate. For most non-taxable California blended families, a QTIP is often the better fit. It locks the remainder for your children and still preserves a second step-up in basis, because the assets stay in the survivor’s estate. An A-B trust tends to fit larger estates, generation-skipping (GST) goals, or situations needing creditor protection. Neither is automatically right. The decision turns on your asset values, your basis, and your family goals, so it is worth reviewing with an attorney.
Yes, if your plan allows it. With a simple joint trust or an “all to my spouse” plan, the survivor can usually amend their share and leave it to anyone. An A-B trust or a QTIP trust prevents this. The remainder for your children is fixed and cannot be changed by the surviving spouse.
The biggest mistakes are relying on a basic “all to my spouse” plan, commingling separate property, and forgetting to update beneficiary designations. Out-of-date forms and joint titling often override the trust. Each one can quietly cut your children out of the inheritance you intended.
If you want stepchildren to inherit, you must name them. California law does not treat unadopted stepchildren as your heirs in the ordinary case. Name them directly in your trust or will, or consider legal adoption. Without that step, stepchildren generally receive nothing through intestacy.
Generally, no. Stepchildren do not inherit automatically under California intestacy unless you legally adopted them or named them in your estate plan. There is one narrow exception, under Probate Code Section 6454: a stepchild can inherit through intestacy only if the relationship began during the stepchild’s minority and continued throughout your joint lifetimes, and there is clear and convincing evidence that you would have adopted the stepchild but for a legal barrier. That exception rarely applies and is hard to prove, so do not rely on it. If you want a stepchild to receive part of your estate, you must say so clearly in your trust or will.
Yes. Remarriage is one of the clearest triggers for an update. Review your trust, your will, your beneficiary designations, and how you hold title. An old plan may still name an ex-spouse or leave your new family unprotected. Updating it keeps your wishes current.
Yes. The main benefit today is control, not tax savings. Under the $15 million per person federal exemption, most California families owe no estate tax. An A-B or QTIP trust still fixes your children as the beneficiaries who receive the remainder, while your surviving spouse is provided for during life. That control is the real value for blended families.
Yes, for the irrevocable B (bypass) trust. Those assets are excluded from the survivor’s estate, so they do not receive a second step-up at the survivor’s death under IRC Section 1014. Your children may owe more capital gains tax as a result. This is a key reason a QTIP is often preferred for non-taxable California estates.
When to Talk to a California Estate Planning Attorney
Some blended-family situations clearly call for individualized advice. You want to provide for a new spouse without disinheriting your kids. You hold significant separate property. You are weighing an A-B trust against a QTIP. Or you have not updated your plan since remarrying.
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Opelon LLP builds blended-family estate plans for San Diego County couples. These plans protect the surviving spouse and lock in the children’s inheritance. We use the structure that actually fits, whether that is a QTIP, an A-B trust, or separate trusts. Our office sits in Carlsbad, California, and our Managing Partner holds an LL.M. in Taxation. If a family disagreement ever turns adversarial, we do not litigate; we will point you to trusted trust litigation counsel. To start, you can request a free estate planning consultation in Carlsbad. |
