Is OTHER wrong in the post ? POST : A little backstory first. My little sister is 22 and practically homeless. She lives in a tent behind my parent's RV with her boyfriend and recently got pregnant. (It's a total shit show if you ask me) They keep saying they need to find an apartment, but aren't doing the work necessary to do so. My older sister has even offered them her old apartment for a reasonable price, but they say they can't afford it.

She now wants me and my other sister to plan and pay for her baby shower. I said ok, no problem, thinking it would be just us ladies in my aunt's backyard. When I asked how many people she was inviting, she said that she wanted a co-ed shower with 100+ guests. I was blown away. 

The bulk of the guest list is daddy-to-be's family and when we asked his sister if she would contribute, she didn't even answer the text. Later I found out that his sister makes A LOT more money than me and my sister combined. My older sister and I make barely living wages and just can't afford it. On top of this, my older sister is trying to plan and pay for her own wedding next year.

Would I be the asshole if I didn't pay a dime for the shower? I'd still help plan, decorate and make centerpieces and stuff though. 