I know I am overthinking this and just need some outside perspective.
The original plan for the rehearsal dinner was bridal party and plus ones and immediate family only. We have 11 BM and 11 GM so that already was an insane amount of people and my FMIL and her husband are graciously hosting it at a restaurant.
We recently decided to have my mom escorted down the aisle by my cousin - so now he is obviously in the wedding.
My question/concern is this. Is it rude to only invite the cousin to the rehearsal dinner? If we were to extend an invite to his family (my aunt and uncle and his siblings) it would add 6 people to the rehearsal dinner cost. It would then get complicated with me inviting some extended family but not other (this would only leave one aunt and uncle on my side that would NOT be invited) I just picture it being awkward because they are all traveling from out of town and will be staying together - so my cousin would just randomly be dipping out to go to a pre-wedding event that the rest of the group was not invited to.
Is that insanely rude or am I overthinking?? For reference the cousin is in his mid twenties.