I don't want to go to this party?!!?

my mom's best friend is having a party for her youngest daughter's first communion. I really don't feel like going to it though. It's not the best friend or her youngest daughter, but it's her other kids. She has three other kids who kind of are annoying to me a bit. I mean I can handle it for like a few minutes, but they're all younger than me by like 2 or 3 years. Anyway there like in that phase that they're like gossipy and just really annoying/mean about some things.They're just not the kind of people that I'm friends with and the other guests are pretty much the same to. Any ideas about how I can get out of this party???