Can I adopt my stepchild if the biological parent is mentally incapacitated in Washington?

Yes, you can ask a Washington Superior Court to approve a stepparent adoption when the other biological parent is mentally incapacitated, but how the court treats that parent's role depends on the facts of your situation. Washington's adoption statute, Revised Code of Washington Chapter 26.33, does not give us a separate, simple rule for this situation in the information we rely on. Please confirm those details with the Superior Court clerk in your county or with a Washington family law attorney.

What depends on your facts:

• Whether the parent has a guardian, and whether anyone must be notified or must consent for them.
• Whether the court will appoint someone to represent the parent's interests.
• Whether the parent's incapacity affects how the court views their consent or their contact with the child.

These are the questions to bring to the clerk or an attorney before you file, especially if anyone might contest the adoption.

What Washington law does tell us:

• Abandonment: Washington sets no fixed number of months. Under RCW § 26.33.120, abandonment depends on the parent's overall conduct. Whether and how that applies to a parent who is incapacitated is a point to confirm with an attorney.
• Child's consent: A child who is 14 or older must consent (RCW § 26.33.160).
• Residency: There is no minimum residency period. Venue and filing rules are in RCW 26.33.030.
• Home study: It is not automatically waived (RCW 26.33.220). Washington allows courts to waive it for stepparent adoptions in certain circumstances, and the clerk can tell you whether yours qualifies.
• Background checks: Washington requires criminal background checks for adoptive parents.
• Marriage length: Washington does not specify a minimum marriage duration.

Documents to gather: Anything that shows the parent's situation can help you and the clerk or attorney understand your case. Examples are court orders about guardianship or conservatorship, if they exist, and medical documentation. Ask the clerk which of these your county expects.

Timeline and cost: Stepparent adoptions in Washington typically take 3-6 months. Court filing fees generally run $200-$500, and the total cost is typically under $1,000, compared with $3,000-$5,000+ when hiring an attorney for the whole process. If your case turns out to be complicated, you may still want an attorney for that specific issue.

How we help: StepParent Adoption 360 is a document preparation service, not a law firm. You answer questions online, and we prepare the complete court document package for your county. You then file it yourself without an attorney. The price is $349 for the first child and $99 for each additional child. Court-ready documents are delivered within 24-48 hours after you finish the questions, and we back them with a 100% court acceptance guarantee. We have helped 1104 Washington families, and more than 34,000 families nationally since 2001.