<human>: Can you condense the text into a few key points?

A heated argument happened the other night and it was revealed to everyone the extent of his cheating. I reached my boiling point and told him to go away and never come back. He packed up  some of his things and my mom thinks he's no longer planning to come back. 

My mother has put up with him for years. Despite his cheating since I was a kid, my mom still feels pity over him but to me, he's completely destroyed and unredeemable. He managed to sleep with our female employees, pay one to actually afford to buy a house, molest a housemaid for months then paid her for her silence. His father, who's a lay minister, did the same thing to one of our housekeepers. He even had the nerve to advice my dad to go to his mistress' house to apologize to his mistress' parents when my mother fired her. I hate him so much I want him imprisoned for what he did to those girls. I just don't know if it has legal standing since none of them filed a case against him and settled with money instead.

It bothered me as a kid why my mom never filed for divorce. I don't think that's an option for her now. I'm afraid it might suck the living daylight out of her as she's now worried about her deteriorating health. We do want to legally separate him from the family. He has asked for independence on his side of business. However my parents still share a bank account and assets. Luckily my mom is the one who signs the contracts and contains full confidence from her business clients. What worries her is my dad's business is only breaking even with his finances. He had been secretly paying bank penalty fees since October. I don't want him to bring us down and have us buried in debt but my mom says she can't let him fall because it would reflect poorly on her credit.  

Apart from kicking him out of the house and future division of assets and bank account with my mom, how else can we cut him off from our lives? 

If there is a specific sub I can address this to, feel free to recommend.
<bot>: Dad cheated multiple times but Mom still feels pity over him. I want to completely cut him off from everyone. What other steps should we take?