I really, really hate people who only post about their kids and family on facebook
Do you feel that way about other things as well?
No, just when people constantly post their kids and family.
You can react how you want, and you can also ignore it too like most mature adults. People post what they like, so you might as well grow up and get used to it. You'll be quite annoyed and hateful if you keep using Facebook, because it is not going to go away just for you.
It pisses me off.
You can feel how you want, but you should consider how those people feel posting their photos. They just want to spread their happiness, joy, and show off their pride. How about trying to interact with these people, they are usually a ball of sunshine!