You and your family have allowed your father to continue living his life dependent upon all of you. I hope your aunt's house is in your and your sister's names, or you will have no say about who your father invites in. The time has come to put your foot down. Consult an attorney for legal guidance about this matter.
You are not obligated to financially support any person to whom your father takes a liking and wants to live with, married or not.
For my own sanity, I left him. Now he's promising he will have counseling (toget
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