<human>: Here's the story... my girlfriend's dad is a businessman, but has in the past year or so become a drunk of epic proportions. He's not abusive, but he is useless and destructive to the family and business. He spends recklessly, cannot take care of himself (most recently he shit his pants and bed) and causes my girlfriend endless emotional and psychological distress. His wife will not leave him out of loyalty and their finances are all intertwined. He spends a ton of money on things they don't need (toilet in the backyard, why not!) and leaves the bills up to his wife and his oldest daughter (my girlfriend). The question is, what can she do? She's all for her mom kicking him out, but she won't. Is there any kind of legal action she could take to prove he's out of his mind and could take control of things? Any advice is greatly appreciated...

Can you condense the text into a few key points?
<bot>: Girlfriend's dad is a drunk who can't take care of himself but is destroying the family, can she legally take any action?