Where to find laws for TX case in which parents severly mistreated their adult child after a misdiagnosis?

In my opinion, the mistreatment bordered on abuse. Where would I find all laws related to this type of case? Thank you
Update: I'm on the side of the adult offspring btw.
Update 2: I am trying to find laws for the civil issues, not the malpractice area of the case.
1 answer 1