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WHAT ACTUALLY CHANGES ON THE BIRTHDAY

Nothing about it is gradual. The switch flips.

At 18 your child holds sole authority over their own health care and their own money. Doctors stop talking to you. Schools stop sending records. Federal privacy law draws that line, and front desk staff follow it whether or not your child can read a consent form. Most parents learn this during a crisis, standing in a hallway, being told they cannot get an answer.

A Will does not fix this. It nominates a guardian for a minor child if you die. It does nothing the morning your living child turns 18. Different problem, different document.

Indiana also has a default rule for medical emergencies when an adult cannot speak for themselves. It hands the decision to a group of relatives who each get a say. If they disagree, the hospital waits for a court.

START WITH THE LEAST RESTRICTIVE OPTION

Indiana courts do not hand out guardianships freely. The law asks for the least restrictive option that meets the need, and your petition has to explain why a smaller tool will not work. Ask that question before you file anything.

Your child can sign legal documents if they understand three things: what the document does, what powers it hands over, and who receives them. That bar sits lower than most parents assume.

If your child clears it, a financial power of attorney, a health care representative appointment, HIPAA and FERPA authorizations, and a supported decision-making agreement can cover most of what you need. Indiana built supported decision-making into law in 2019, and families have usually never heard of it. Your child names people who help them think a decision through. Your child keeps the final say.

One limit. A power of attorney adds a helper, not a brake. Your child keeps the right to sign a contract, spend money, and refuse treatment. If your real concern is protecting your child from their own choices, documents will not get you there.

THE TIMING PARENTS GET WRONG

Around age 17½ is when this starts. Not the month before the birthday.

Indiana courts will not appoint a guardian before the 18th birthday, so you cannot file early. The preparation is what takes longer than families expect, and the physician statement is usually the bottleneck. Your child’s treating physician fills out the standard Indiana form, not a specialist your child saw twice. Getting that appointment takes weeks. Some physicians have never completed one. Some need a second visit before they can answer the prognosis question honestly. More than one statement is often a good idea, depending on who treats your child.

Detail matters on that form. “Patient has cognitive delays” tells a judge almost nothing. A description of what your child can and cannot do, and how that looks on an ordinary Tuesday, tells the court what it needs.

WHAT COMES AFTER THE ORDER

Then plan past the order itself. An inventory comes due within 90 days, and an accounting every two years after that. The accounting has two halves, and everyone remembers the money half. The second half asks whether the guardianship is still necessary and whether anyone has looked at a less restrictive alternative since the last filing. Your child grew. The court wants to know if the authority still fits.

Most of this work will feel familiar, because you have been doing it for years. What changes is that a court now supervises it and the record has to exist. The parents who find this manageable set up the file in month one. The ones who struggle are the ones reconstructing.