Why do many people alienate their adoptive parents when they find their biological parents?

I am also two families, but on the one hand, I am an adoptive parent with harmonious family and loving husband and wife, and on the other hand, I am a biological parent and family I don't like. The family background is too complicated to talk about. Close your feelings and be good to yourself first. I wish you a happy life, too, and distinguish between those who spend more time with you and those who pay more. Don't let yourself regret it, and don't let the person who loves you wait too long.