How to Secure Guardianship of an Adult Child with Autism in Indiana Upon Turning 18

Current as of: September 28, 2026 Guardianship & Conservatorship Indiana
When an Indiana child with autism turns 18, parents lose the legal right to make medical and financial decisions. To prevent gaps in care, parents should begin the guardianship process at age 17.5, filing a petition in the local probate court with a physician's report. Court fees are typically around $177.

Watching your child with severe autism approach adulthood is a major milestone. However, in the eyes of Indiana law, when your child turns 18, they are legally considered an independent adult. On that day, you instantly lose the authority to make their medical, educational, and financial decisions, regardless of their developmental level. Doctors will no longer be allowed to discuss treatments with you without the child's consent, and IEP meetings at school will require the student's legal authorization.

To continue providing uninterrupted care and protection, parents must apply for legal adult guardianship. Because this process removes a person's fundamental legal rights, the courts require strict medical evidence and procedural steps. To ensure a smooth transition, we highly recommend hiring a compassionate local lawyer from our USA Lawyer Directory to guide your family through this emotional legal process.

Step-by-Step Process for Transitioning to Adult Guardianship

This process takes place in your local county court, such as the Hamilton County Superior Court, Noblesville or the Lake County Circuit Court, Crown Point.

Step 1: Starting the Process at Age 17.5

Do not wait until the child's 18th birthday to begin. You should start the legal process when they are 17 and a half years old. This provides your attorney enough time to file the paperwork so the court can schedule a hearing right around the child's 18th birthday. Proactive filing prevents any dangerous gaps in medical consent for ongoing psychiatric treatments or therapies.

Step 2: Navigating Limited Guardianship vs. Plenary Guardianship

Indiana law strongly favors maximizing the independence of individuals with developmental disabilities. Under Ind. Code § 29-3-5-3, courts are encouraged to establish a limited guardianship whenever possible. In a limited guardianship, the guardian only controls specific, difficult areas (like complex medical surgeries or managing large government benefits) while the adult child retains the right to vote, work, or make basic life choices. A plenary (full) guardianship is granted only if the autism is so severe that the child cannot safely make any decisions independently.

Step 3: Obtaining Required Medical Evaluations

You cannot simply tell the judge that your child has autism; you must prove their legal incapacity medically. Your child's treating physician must complete a Form Unnumbered, Indiana, Trial Court, Physician's Report on Incapacitated Person. This comprehensive document details the diagnosis, the severity of the cognitive impairment, and explains exactly why the individual cannot manage their own affairs.

Step 4: The Role of the Guardian ad Litem

After your lawyer files the formal petition, the court will likely appoint a Guardian ad Litem (GAL). The GAL is an independent attorney appointed to represent your child's best interests. They will visit your home, speak with your child, and report back to the judge on whether the guardianship (and the chosen guardian) is truly appropriate.

Step 5: The Court Hearing

At the final hearing, the judge will review the medical reports and the GAL's recommendation. While courts generally approve petitions brought by loving parents, they rely heavily on medical evidence. Precedents like In re Guardianship of V.S.D., 660 N.E.2d 1064 (IN Court of Appeals 1996) show that courts prioritize clear medical consensus when deciding the scope of the guardianship over an adult.

Guardianship TypeAuthority GrantedBest Used For
Limited GuardianshipOnly specific areas ordered by the court (e.g., medical or financial).Adults with mild autism who can manage daily tasks but struggle with complex issues.
Plenary GuardianshipTotal control over all personal, medical, and financial decisions.Adults with severe developmental disabilities who require 24/7 care.

How Much Does it Cost in Indiana?

Transitioning to adult guardianship involves several specific fees.

  • Court Filing Fees: It costs roughly $177 to file an adult guardianship petition in most Indiana counties.
  • Lawyer Fees: An uncontested guardianship for a special needs child typically costs between $1,500 and $2,500.
  • GAL Fees: The court-appointed GAL usually charges between $300 and $800 for their independent investigation.

How Long Does the Process Take?

The entire process, from filing the initial petition to the final hearing, generally takes 2 to 4 months. Starting exactly six months before the 18th birthday is the safest timeline to ensure the court order is signed the moment they become an adult.

Frequently Asked Questions (FAQ)

What if my child can make some, but not all, decisions?

The court will likely issue a Limited Guardianship. This tailored order allows your child to keep certain rights, like choosing where to work or spending pocket money, while you legally manage complex healthcare procedures or major finances.

Do we have to go to court every year?

Usually, you will not have to appear in court, but you must file a biennial (every two years) written report with the court. This report updates the judge on your child's medical condition, living situation, and any major changes.

Does the guardianship expire?

No, an adult guardianship generally lasts for the life of the incapacitated person, unless the court determines they have regained capacity or you ask the court to appoint a successor guardian if you can no longer provide care.

Can the parents be co-guardians?

Yes, both parents can be appointed as co-guardians. This is highly recommended, as it allows either parent to make emergency medical decisions, sign legal documents, or manage bank accounts independently.


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