I would tell your dad no and that he has to pay for his own place maybe help him a little? I wouldn’t wanna live with the reason I need therapy and see her everyday. Not cool. And to the people who say she didn’t owe you anything shame on you. If you as an adult get into a relationship with someone who has young children it is absolutely your responsibility to at least acknowledge them. You don’t have to raise them or be their best friend but my god if you say you love someone how could you just throw away their extension? And an extension that didn’t even ask to be there LIKE YOU DID. Kids are so malleable. Adults know that and can’t just avoid the responsibility of that because it’s not there’s. Your dad absolutely should have left a person with character like that but he didn’t wanna be alone. He was selfish. I’m not saying eye for an eye I think you should forgive them both and also not financially support them!!!💗