I know several people who cut ties with their toxic family. It's painful, but sometimes it's necessary. They replace their family with friends. Good friends who support them.
In cases where only one or a few people are abusive, it may be possible to gather the rest of the family and continue a healthier family without the toxic people.
You can have children but children are not the kind of family you can depend on and look up to for advice. You can also marry into another family, but frankly the same strength of bond is just not there (guess which person that family will choose to side with if you get a divorce).
It takes a pretty seriously bad family for it to be worth destroying because people don't want to lose that irreplaceable attachment.