Christian turned 18 four years ago. Six days before his birthday, I walked into his pediatrician's office to pick up a refill. The nurse, kind as she always was, leaned across the counter and said, "We just want to let you know — starting Monday, we can't talk to you about Christian's medications. He's an adult. We need his consent."
Christian, at that moment, was sitting in the waiting area humming a song from a children's show he has loved since he was four.
I am an estate planning attorney. I knew this was coming. I had my guardianship papers drafted. I had already filed. I had, in every meaningful sense, done all my homework. And I still walked out to the parking lot and cried, because there is a difference between knowing something legally and feeling it in your body.
What the Law Does on That Birthday
On a Texas resident's 18th birthday, a wall comes down. The presumption of adult legal capacity applies regardless of developmental status. Parents of a young adult with an intellectual or developmental disability are no longer, by default, authorized to:
- Consent to medical care
- Access medical records under HIPAA
- Make financial decisions
- Sign for school accommodations, services, or transition plans
- Authorize vaccinations
- Speak with prescribers, specialists, or therapists about care
The wall does not care whether your child can read, whether they can tell you their phone number, or whether they understand that signing a paper has legal consequences. The wall comes down on the birthday.
The Three Main Paths Forward
Texas law recognizes three primary paths for a parent who wants to continue supporting a young adult with diminished capacity. They differ enormously in intrusiveness, cost, and the message they send to the child and to the world.
Full guardianship — the oldest, strongest, and most intrusive option. A court finds that the young adult lacks capacity across the board and appoints a guardian of the person, the estate, or both. The young adult loses the legal right to vote, marry, sign contracts, and make medical decisions. Guardianship is the right answer for young adults with profound intellectual disabilities and limited capacity to direct their own care — and it is overused for young adults who could do more if given the chance.
Limited guardianship — a middle path where the court grants the guardian authority over specific domains (medical, financial, housing) while the young adult retains capacity in others. This is underused in Texas and is often the right structural answer for young adults who can handle some decisions independently.
Supported Decision-Making Agreement (SDMA) plus POAs — the least restrictive path. The young adult retains full legal capacity but signs an SDMA and medical and financial powers of attorney, authorizing designated supporters to help them make decisions. This works when the young adult can understand what they are signing and can appoint trusted supporters. Texas adopted the SDMA statute in 2015 and courts are increasingly pushing families toward this option when appropriate.
The Conversation I Have With Every Family
The question I ask every parent is not, "Do you want guardianship?" The question is, "Where on this spectrum does your child actually live?" For some children, the answer is plainly full guardianship — and the law should not make that harder than it already is emotionally. For others, the answer is an SDMA with carefully chosen supporters, and a parent who learns to step back in a way they have never had to before.
Christian is somewhere in the middle. We pursued a limited guardianship focused on medical and educational decisions while preserving his autonomy in day-to-day areas. It was the right answer for him. It may not be the right answer for your child.
The One Thing You Cannot Do
The one thing you cannot do is nothing. If your child turns 18 and you take no action, you have lost legal authority to make medical decisions for them — and you cannot simply reclaim it. Texas probate courts require a formal application, a physician's certificate, an attorney ad litem for the proposed ward, and often a hearing. The process takes months. Until it is complete, you are a parent with no legal standing to access your adult child's medical chart.
Start 6 to 12 months before the birthday. Get the physician's certificate scheduled. Draft the application. File early. Show up to the hearing with documentation, not emotion — the court respects preparation.
And then, on the day itself, give yourself permission to feel what I felt in that parking lot. Legal work is work. Watching your child become a legal adult in the middle of a disability is something else. Both are allowed.
Carla Alston leads the special needs planning practice at WG Law. Learn more or schedule a consultation.