Can My Stepparent Adopt Me as an Adult in Illinois?

Many adults reach a point where they want their stepparent’s legal status to match the emotional reality they’ve lived for years. If that’s true for you, then you might be wondering whether a stepparent can adopt an adult child in Illinois.

Whether your stepparent has been in your life since childhood or you’ve built this bond more recently, Illinois law provides a clear path forward.

Below, we’ll walk through everything you need to know about adult adoption in Illinois, including the benefits, legal requirements and timeline. Ready to take the first step? Schedule a consultation with an experienced adult adoption lawyer today.

Can My Stepdad or Stepmom Adopt Me as an Adult in Illinois?

Yes, a stepparent can adopt an adult child just as they would adopt a minor. In fact, adult adoption has become increasingly common as families recognize the value of legally formalizing relationships that already exist in practice.

The process is more straightforward than child adoption because it doesn’t involve home studies, background checks or lengthy court investigations. As an adult, you can make this decision for yourself, which means you don’t need the extra steps that protect children.

Illinois law treats adult adoption as a voluntary agreement between two consenting adults. This means that once you and your stepparent decide to move forward, the legal process is primarily about completing the right paperwork and obtaining court approval.

Why Adults Choose to Be Adopted by Stepparents

The benefits of being adopted as an adult include legal protections and personal validation.

Legal Recognition: For many people, adoption is the final step in acknowledging who truly raised them. It’s a way to formally say, “This is my parent — the one who was there when it mattered.”
Inheritance Rights: When a stepparent adopts an adult child, that child gains full legal status as an heir. This can simplify passing down assets and prevent disputes in blended families.
Shared Family Identity: Some adults choose to take their stepparent’s surname as part of the adoption, while others simply value the legal recognition of their family bond.
Practical Protections: Adult adoption clarifies rights for medical decision-making and access to family benefits that might otherwise be limited to biological relatives.

Legal Requirements for Adult Adoption in Illinois

Adult adoption in Illinois is meant to be a simple and straightforward process, but there are still several requirements you must meet before a judge will finalize the adoption. These include:

Mutual Consent: Both you and your stepparent must agree to the adoption.
Age Requirement: Both the adoptee and the adopting stepparent must be at least 18 years old.
Former Stepparents May Adopt: A 2024 Illinois law allows a stepparent to adopt an adult child even if the marriage to the biological parent has ended.
Proof of a Genuine Parent-Child Relationship: The court will look for signs that the relationship is real and long-standing, not a legal formality for unrelated purposes.

Do You Need Biological Parents’ Consent for Adult Adoption?

No. Because you’re an adult, you can make this decision independently. However, adult adoption may affect your legal family relationships. An experienced adoption attorney can explain how the adoption will impact your existing legal ties with your biological parents and what this means for matters like inheritance.

The Forms You’ll Need for Adult Adoption in Illinois

Illinois adult adoption forms typically include:

Petition for Adoption of an Adult: This form asks the court to approve your adoption. It includes basic information about you, your stepparent and why you’re seeking the adoption.
Consent to Adoption: Both you and your stepparent will need to sign forms acknowledging that you’re entering into this relationship willingly and that you understand what it means legally.
Final Order of Adoption: This is the document the judge will sign to officially grant the adoption. You don’t prepare this yourself — your attorney prepares it, and it is then entered by the court — but you’ll receive a certified copy for your records.

Depending on your county, there may be additional forms or requirements, such as a statement about any previous adoptions or name changes. Some counties also have specific local forms that supplement the standard state forms.

Many people find it helpful to work with an attorney who can ensure all forms are completed correctly and filed in the right order. Missing information or procedural mistakes can delay the process or result in your petition being rejected.

How Long Does Adult Adoption Take, and How Much Does It Cost?

Adult adoption is quicker than child adoption because it doesn’t require background checks, home studies or the extensive investigation that protects children’s interests. In many cases, the entire process can be completed in just three to four weeks if everything is uncontested.

As for costs, Illinois adult adoption is relatively affordable. Court filing fees are $89 in most Illinois counties, including Cook, DuPage, McHenry and Will. If you choose to work with an attorney, legal fees will vary but are generally reasonable given the straightforward nature of most adult adoption cases.

Can You Change Your Name During Adult Adoption?

Yes, you can change your last name during adult adoption as part of the same legal process.

When you file your Petition for Adoption of an Adult, you can include a request to take your stepparent’s surname. The court will address this as part of the adoption decree, so you won’t need to file a separate name change petition or go through an additional legal process.

You’re not required to change your name. Many adults choose to keep their current surname while still formalizing the parent-child relationship. But if you do want to take your stepparent’s name, adoption provides a streamlined way to make that happen.

Why You Should Work With an Illinois Adult Adoption Lawyer

While you don’t technically need a lawyer for adult adoption in Illinois, working with an experienced attorney can make the process significantly smoother and help you avoid costly mistakes.

An adult adoption lawyer near you who knows Illinois adoption law and local court procedures can ensure your paperwork is completed correctly the first time, avoiding delays or rejections. They can also advise you on unique circumstances and handle any complications that arise.

For many families, the reasonable cost of hiring an adult adoption lawyer is well worth the assurance that this important legal process will be handled correctly, typically allowing you to finalize your adoption within three to four weeks.

Ready to Make It Official? Start Your Adult Adoption Journey

Formalizing your relationship with your stepparent through adult adoption is a meaningful way to honor the bond you share.

At Gillespie Law Group, LLC, we understand how important these family relationships are. Our experienced team can guide you through every step — from preparing the necessary forms to representing you in court.