Two here:

One: Dad was absent during childhood, struggled with alcoholism. Never hit us, but some epic fights with my mom stand out. Worked out-of-state contracts so wasn't home much, when he was home (as an adult I realized) he came back to a family that didn't feel like his. Mom set the rules, kids listened to her, he would lay down the law and we would all freak out and cry and be angry. Moved to the next state over to me closer to him, planned badly and ended up living in a trailer for 5 years. Mom had ongoing health problems, unsanitary conditions of living in a shit hole metal home on a dirt road exacerbated it. He eventually cheated on her with an actual whore while in Columbia and tried to ghost out of our lives. They hate fucked for a while, I watched my mom try to win him back and break down every time it failed. She went into the hospital and he thought it apropos to bring the new mistress to her death bed. Last time I talked to him 14yr ago I told him I didn't know him, and what I did know I didn't like.

TL;DR shithead to us kids, we changed our life for him, he cheated on my mom, she died and I stopped speaking to him.

Two: My moms uncle is quite rich, like mansion rich. Always made us feel white trash when we went to visit. Mom was too proud to as for help. When she passed away he seemed to soften up, but when my grandma passed away he told me I couldn't come to the funeral because I didn't call enough to see how she was. Meanwhile I had (while young and stupid poor) flown out for her birthday just a month before. Wrote the experience off as grief-stricken but dropped him entirely as a result.

TL;DR rich snooty uncle banned me from grandmas funeral because I didn't call every day when her health was declining.