Well, no, if the "kid" is 24-years old then assistance and support is required, but 'taking over' seems reasonable only if they're in a coma after an accident.
After all, it's their life, and any decisions on how/wether to proceed and what to avoid are completely theirs to make - they may take advice from parents, or they also may not want their parents to have any say whatsover in how to handle it.
After all, it's their life, and any decisions on how/wether to proceed and what to avoid are completely theirs to make - they may take advice from parents, or they also may not want their parents to have any say whatsover in how to handle it.