My mom is frustrating me...

Okay, so the other day my mom was like "Josh's family is gonna have to do their own baby shower, because everyone on our side of the family wants to help with it" (josh is my boyfriend btw, lol) and I tried to tell her no, that I didn't want to do two baby showers.. For one, that's just too stressful, and for two, I think it's kinda rude to Josh's family because they're supposed to be a part of it too, and my mom just isn't understanding that and it's really pissing me off.. Like sorry we're having one baby shower, not two! I think the more people that help the better! Ugh :( it's just really bothering me..