Vent session

M
I came up with my fiancé's daddy diaper party idea and asked his friends wife if they thought he'd like it..they graciously said they'd plan it so that I didn't stress over it... well apparently they already sent invites out because his friends brother in law offered to have it at their house...which is great..but I told her i had more people I have yet to confirm if they were interested or not or you know..coming for sure...well she was texting me last night Gave me the list of people she sent invites too and now basically wants to exclude my family because they don't want to overwhelm (the brother in law/host) with toooo many people...I find it completely unfair!! I was thinking more bowling alley, bar, diapers for games and such ...but apparently it's just a card game night type of deal to them and I'm not really sure how to express my opinions without starting something