Bachelorette Party Rant

Im planning my bachelorette party which is not a problem however I’m no contact with practically my entire family except my siblings. I invited them to my bachelorette party (both of them) a few weeks ago and haven’t heard anything. So this week I’ve been pushing hard on a confirmation. Nothing, nada, zilch. They’re my only family, it’s okay to say no if they can’t but the no response is soooo annoying. I can’t plan or book anything without getting a full head count and if I start booking without them they are going to be pissed. This is just a rant but seriously, I go to every important thing of theirs. Everything. They ask and I’m there without a doubt. I don’t even need them there I just need an answer. Am I being a bridezilla or is my anger justified?