I haven't spoken to my brother since 1999. I see my sisters once or twice a year, and talk to one of them at least monthly.
There's no hate — we're just different people living different lives. None of us are close. If any of us died, the others probably wouldn't even know.
I think it traces back to the hostile environment we grew up in. We learned to shut each other out, and seeing one another just brings that childhood back, so we keep our distance.