I completely agree @JudgingNC I think - and this is just my opinion, that if a parent and a child/adult child have a falling out, surely in most cases it's up to the parent, (the person who should be the more mature adult,) to try and sort it out, not the child. Whether the child in their late teens or 20s or 30s or whatever. I think the parent should be responsible for sorting it out. And yes, I seriously judge any person who has no contact with their child or children. What kind of person DOES that? You would have to be very cold hearted.
I know a woman who has an adult child in her mid to late 30s. (This woman is in her late 50s.) She's had nothing to do with her daughter since she (her daughter) was 16 years old. She lived with her nan since she was 7. So for some reason she wasn't able/couldn't be arsed to look after her.
I think she was twenty when she was born, and the baby was unplanned and with a man she had been with for only a few months, so she was left as a single mum, and her nan took the child on when the child was 7. And as time went on, she (the woman) moved away and didn't visit often and said she felt nothing towards her daughter.... Not like she felt for her son who she had when the daughter was 10, who she seems to worship! For goodness sake, this woman is in her late 50s now, she's had plenty of time to make contact/make amends. Yet she doesn't care, and tells everyone she only has a son..
Also, I work with a woman, (around 63,) who retires in a couple of years. She has two sons who are both in their 30s and 40s. She fell out with one in 2012 (and his wife,) and then fell out with the other about two or three years later (and his wife.) Never spoken since ... It's all their fault, of course, not hers. So she has nothing to do with them all.
She has never met 2 of her four grandchildren and doesn't have anything to do with the other two anymore. She doesn't see them, doesn't know them. She also fell out with her sister in 2007, and apparently that was her fault as well. She's also fell out with her best friend from childhood about 12 years ago. Her best friend's fault as well. I see a running theme here .. It is definitely her. and I really seriously judge this woman...(and the one above...). I mean, what kind of person doesn't want anything to do with their own children? Awful!