I've see both real dads and step dads that were sorry MF's. I was lucky in that I was never affected by that. But some folks are just scumbags no matter what role they have in life. Never personally had a relative that I knew on either side of my family that was estranged. Had a great uncle who was my grandmothers older brother that went down the wrong path and became a wino. Family hadn't seen or heard from him in years. When I was 8 years old he passed out in an alley one night and never woke up. My grandmothers family got him a cheap plot with a small stone and buried him. I never even knew of his existence until I was in my late 30's. Even then some older relatives wouldn't say much about him.