You're the one who brought it up. If you're already fine with it, and I misread your several comments as your being conflicted about all that, forgive me. But "You can tell me these magical 'supportive' people exist, but to me they are entirely theoretical" really doesn't sound like you're okay with it.
All that said, just because people are family doesn't mean they can't be shitty shitty people. Just because you've known someone a long time doesn't necessarily make them a friend.