I think what you’re seeing is mostly the effect that our environment has on us. All of these people have the same biological father. Probably most of them were raised without a man in their house, seeing as they were often brought up in same sex “marriages”. However, some might have a grandfather or uncle that could’ve been around occasionally as they grew up.
What I found interesting is that these kids are all learning about sibling relationships in a totally unnatural way, something that is pervasive in their lives. It’s kind of sad.
Sperm donors are adulterers. As are the women.