Its interesting that people value their relationship with their children so much and I assume its due to a deep sense of connection with them, they being "flesh and blood" but I've never given that any weight. I feel much more connected to people who have had similar life experiences and ideas to myself, and that could be anyone. I have quite a few relatives who I've never met or met once and do not see because they are nothing like me.
I suspect this is mostly due to being pretty far out on the pointy bits of various bell curves.