So my fiancé sent out invites for our daughters first birthday party next month to certain people on…

So my fiancé sent out invites for our daughters first birthday party next month to certain people on our friends list. His cousin was included on that list. He used to visit them a lot before I moved up to PA with him and before we had our daughter. He doesn't really have time to these days. Apparently she told his other cousin that they are not coming to our daughters birthday party because 1)they are going on vacation and 2)he doesn't visit them anymore and they are holding a grudge. Seriously? So they are taking it out on our daughter and being petty, why? Im so irritated. Last time I checked, it's a 2 way street. They could also come visit! Sheesh. Sorry for venting yall.