Huh, I have no idea how many brats my sisters have spit out now, they're adults doing their own things around the country, I don't really have any reason to bother with shit as annoying as social media just to keep track of whatever they're doing. They're family and all but I don't really care what they're up to anymore, I barely keep in touch with my mom because she's fun to bullshit with now and then. I'm not an uncle because I don't care to be, maybe I'll meet their kids and think they're cool enough little monsters to add them to my family, maybe not.
I don't engage in bookfacery anymore, so why add unnecessary tags to my identity, the missus and I are so much happier without the bullshit of trying to keep track of all these links and engage in interactions with them, and have been consistently so in the two years since we dropped that shit.
You want a happy thought: contrary to what you may hear, you totally do get to choose your family. I have 5 sisters and a mother, some of them claim to have another sister and a father for their own reasons, but I am not family with those two. They have husbands or whatnot that might think I was a brother-in-law or something if asked, but unless I find a reason to add them to my family they're just dudes my sisters are with, the missus has a brother, but he's kind of an ass and his wife is shitty, so they are not ny family, simple as that. They come over sometimes for thanksgiving or whatever, I remember being asked to associate with them and then realizing I didn't enjoy doing so, so I just stopped, much happier.
You can accept definitions given to you by others if you wish, but you'll be happier if you actually examine them critically and choose to adopt them yourself, I owe my mother respect and such for crapping me into life, she'll always be my family, but I have no obligation to link myself to this extended group of strangers and potentially annoying interactions because she defines them as her family, so I don't. Neat!