For many families, adopting an adult stepchild is about aligning the law with the reality you live every day — one built on commitment, care and chosen family.
Below, we walk through everything you need to know about adult stepchild adoption so you can move forward with clarity and confidence. If you’re ready to explore your options or want personalized guidance, contact Gillespie Law Group, LLC to schedule a legal consultation.
Can I Adopt My Adult Stepchild in Illinois?
Yes. Illinois law allows a stepparent to adopt an adult stepchild as long as both parties voluntarily consent to the adoption.
To qualify for adult stepchild adoption in Illinois, the following conditions must be met:
- The adopting stepparent must be at least 18 years old
- The adult stepchild must also be at least 18
- Both parties must provide written consent
- The adoption cannot be entered into for fraudulent purposes
As of 2024, Illinois law also allows a former stepparent to adopt an adult stepchild, even if the marriage to the child’s biological parent has ended. This change recognizes that parent-child relationships don’t always end when a marriage does, and that long-standing bonds deserve legal protection.
How to Adopt an Adult Stepchild in Illinois: Step-by-Step
Many families wonder whether it’s possible to adopt an adult stepchild without going to court. While the process is far simpler than adopting a minor, most adult adoptions in Illinois still involve at least one short, uncontested court appearance.
Here’s how the process typically works:
- Step 1: Confirm eligibility and mutual consent. Both you and your adult stepchild must agree to the adoption and meet the basic age requirements.
- Step 2: Prepare and sign the required paperwork. This includes the adoption petition and written consent forms.
- Step 3: File the paperwork in the appropriate Illinois county court. The case is usually filed where either party resides.
- Step 4: Attend a brief court hearing. In most cases, this is straightforward and uncontested. The judge may ask a few questions to confirm consent and intent.
- Step 5: Receive the final order of adoption. Once signed, the adoption is legally complete.
There is no statutory waiting period for adult adoption in Illinois. Many adult stepchild adoptions finalize within three to four weeks when paperwork is prepared correctly.
What Forms Are Required to Adopt an Adult Stepchild in Illinois?
In most Illinois counties, the forms required to adopt an adult stepchild include:
- Petition for Adoption of an Adult
- Consent to Adoption (signed by the adult stepchild)
- Final Order of Adoption (prepared for the judge)
- Optional name change request, if applicable
Because local courts may have additional requirements, working with an attorney helps ensure everything is properly prepared and filed.
Do I Need the Biological Parent’s Consent to Adopt an Adult Stepchild?
No. Once a person is legally an adult, they can consent to their own adoption without permission from either biological parent.
That said, adult adoption can affect existing legal relationships, particularly around inheritance rights tied to biological parents. These implications should be reviewed carefully with an attorney so there are no surprises down the road.
Adult adoption does not erase existing relationships or lived history; it simply formalizes the parent-child relationship you and your stepchild have chosen to recognize legally.
What Happens After the Adoption Is Finalized?
Once the court enters the final order, the adult stepchild is legally recognized as your child. A new birth certificate can be issued, if requested, and your stepchild can legally change their name.
While the legal process may be brief, the impact is lasting — offering clarity, protection and peace of mind for your family.
Does Adopting My Stepchild Make Them My Legal Heir?
Yes. In Illinois, once you adopt your adult stepchild, they gain the same legal status as a biological child, including full inheritance rights under state intestacy laws. This can simplify estate planning, reduce the risk of disputes and ensure your intentions are clearly honored.
Do I Need an Attorney to Adopt an Adult Stepchild in Illinois?
Working with an experienced adult adoption lawyer is strongly recommended. Even in uncontested cases, mistakes in paperwork, filing or court presentation can cause delays or rejected petitions.
An attorney ensures:
- All forms are prepared correctly
- County-specific requirements are met
- The court process runs smoothly
- Legal consequences are clearly explained
For many families, the cost of legal support is well worth the peace of mind that comes with knowing this meaningful step is handled properly.
Ready to Make It Official? Start Your Adult Adoption in Illinois Today
Working with an experienced adult adoption lawyer can help you move forward with confidence. With the right guidance, you can take the next step toward honoring the family you’ve already created.
At Gillespie Law Group, LLC, our goal is to give you reassurance at every step so you can focus on what matters most. If you’re ready to take the next step, contact us today to schedule a consultation.