Inside an Estate Planning Attorney's Checklist for Blended Families

Take a household that looks increasingly common: a second marriage where each spouse has children from a prior relationship. On paper, both spouses want the same thing — provide for the surviving spouse while making sure each of their own children eventually inherits something. In practice, three structural problems tend to get in the way, and an estate planning attorney's checklist for blended families exists specifically to catch them before they turn into a legal fight.

Problem one: intestacy laws don't know what "blended" means

If someone dies without a will — dying "intestate" — state law decides who inherits, using a formula written for a simpler family structure. Most state intestacy formulas split an estate between a surviving spouse and the deceased's children using fixed fractions that don't distinguish between "my children" and "my spouse's children from her first marriage." Depending on the state, a surviving spouse might receive the first $50,000 to $150,000 of the estate plus a fraction of the remainder, with the children splitting what's left — and stepchildren who were never legally adopted typically inherit nothing at all under intestacy, regardless of how long they were raised as family. A will is the only way to override this default and actually reflect what a blended family intends.

Problem two: beneficiary forms override the will entirely

This is the one that catches people off guard. Retirement accounts, life insurance policies, and many bank and brokerage accounts pass to whoever is named on the account's beneficiary designation — a form filed with the institution, not the will filed with the court. If a father named his first wife as beneficiary on a $400,000 life insurance policy in 2009, remarried in 2015, and passed away in 2026 having never updated that form, the policy pays his ex-wife in full. His current will, however carefully drafted, has no power over that account. This is why the very first item on a blended-family estate checklist is a full audit of every beneficiary designation across every account — not just a review of the will.

The will is what a person intended. The beneficiary form is what actually happens. Blended families get hurt in the gap between the two.

Problem three: providing for a spouse without disinheriting your own kids

Even with the paperwork aligned, there's a harder tension: a spouse typically wants their surviving partner to be financially secure — able to stay in the house, cover living expenses — while also wanting their own children to eventually inherit something. Leaving everything outright to the surviving spouse solves the first goal but creates a real risk for the second: nothing legally requires a surviving spouse to leave anything to a stepchild, and it's common, even with good intentions, for a second spouse's own will to eventually redirect assets to their own children instead.

This risk is sometimes called the "second marriage problem," and it isn't hypothetical — it plays out any time the surviving spouse remarries again, updates their own will years later under different circumstances, or simply never gets around to naming stepchildren as beneficiaries of anything. None of that requires bad intent on anyone's part. It only requires time, a new set of priorities, and the absence of a structure that locks the original intent in place regardless of what happens afterward.

The tool built for exactly this problem

This is where a QTIP trust — a Qualified Terminable Interest Property trust — comes in, and the concept is more approachable than the name suggests. Instead of leaving assets directly to the surviving spouse, they go into a trust. The surviving spouse receives income from the trust (and, depending on how it's drafted, may have access to principal) for the rest of their life, so they're genuinely provided for. But the spouse doesn't control where the assets go after their own death — that was already decided by the person who created the trust. When the surviving spouse eventually passes, whatever remains in the trust goes to the children named originally, typically the first spouse's own kids. It threads the needle: full support for the surviving spouse, guaranteed inheritance for the children, with no dependence on the second spouse's goodwill or their own eventual estate plan.

A full blended-family checklist typically also includes: written, signed documentation of who should receive specific sentimental or high-value items (to prevent disputes courts can't resolve from a vague verbal promise); a review of whether stepchildren need to be formally named as beneficiaries anywhere they aren't automatically included; and periodic reviews — ideally every few years, or after any marriage, divorce, birth, or death in the family — since a plan built for the family as it existed five years ago rarely still fits.