After Mom or Dad

Book Five · Siblings and the Estate · Chapter 8

What about half-siblings and step-siblings?

“Dad remarried. Does his wife get everything? And what about her kids?”

The short answer

It depends on the will, and on your parent's state if there is no will. Your parent's own children are all their children, whoever their other parent was.

Without a will, a surviving stepparent's share varies by state. Stepchildren are not on Arizona's list of heirs, for example, and whether a stepchild can ever inherit without a will varies by state. If someone promised it would all come back to you, ask a probate lawyer whether that promise counts.

This chapter explains how things usually work in the United States. It is not legal, tax or financial advice, and the rules where you live may differ. Before you act on anything here, check it with one of the people named at the end of the chapter.

What to do

  1. Ask the executor for a copy of the will, or confirm there is none. If nobody is in charge yet, ask the probate court in the county where your parent lived.
  2. Ask the executor which accounts went outside the will, and to whom.
  3. Ask a probate lawyer what your state gives a surviving spouse, and which state's rule applies.
  4. Contact your half-siblings or step-siblings directly, not only through the executor, if you want to.
  5. Write down any promise anyone remembers: what was said, when, and who heard it.

What can wait

Who can help

A probate lawyer in the state where your parent lived can tell you who inherits there, and which state's rule applies.

A mediator can help when the two sides of the family stop talking. How mediation works is covered in When is a mediator worth it?

The rules, phone numbers and web addresses in this book were checked against the agencies’, courts’ and organizations’ own pages in October 2026. Where a rule differs by state, the book names one state as an example. Check anything you rely on with the office itself.

From Book 5: Siblings and the Estate

This page has the short answer and the closing lists from chapter 8. The full chapter explains, in plain words, what exists, what to ask, and who can answer. The book covers months 1 to 18 after the death.

About the book · Every question in the books

Questions near this one

Other questions on related subjects, from this book and the others.

Hear when Siblings and the Estate is out

A short note when each book is out. Five or six emails a year at most. You can unsubscribe whenever you like.

For readers in the United States. We don’t sell or rent your address, and every email has a link to unsubscribe. How we handle your email