Of course it's different for everyone, some families are so tragic they may not be worth preserving, etc. But that's an outlier-- the modal experience is that the power of family is precisely in the fact that you don't get to choose it.
I have not found this to be true.
If you can get friends who live nearby and come over once a month that's probably closer than the modern us family structure tbh
An adopted child is also a form of chosen family. As is a spouse.