You decide what is right

A college educated woman with a good job is severly injuried in an automobile accident and suffered severe brain damage. Shhe was in a coma for a spell and now needs someone to watch over her. She can no longer remember how to do her job, needs constant reminder of her childrens names (they are adults and live elsewhere) and is no more able to care for herself than an eight year old would be to take of their selves. She has had one date with a man who told her she can't wear makeup but asked her to marry him. What is the legal and proper solution to this problem?