disappointed in my siblings

I am so sad and disappointed with my siblings. I have kids getting married, grandbabies are here and more on the way and they don't give a shit. I ask about their kids, fun stuff going on in their lives. It's never reciprocated. I want to just block them all and move on with my own little family. I can never tell my kids either, it would kill them to know that their aunts and uncles never ask about them or their kids.