From day 1 my FMIL & FI's family has been pretty crazy about the guest list. We are only inviting 100 people to the wedding, paying for it ourselves, and made the guest list ourselves. We shared the guest list with FMIL so she knew who would be invited (because she keeps verbally inviting people who are not on the list.) She came back with a list of about 70 family members from his side that "we need to find room for." There is no finding room for these people, majority of which FI doesn't even know! It's been stressful, but we've help strong about it. and already sent out our STDs so everyone would have a clear idea if they were not invited.
I have been venting to my own mother about this a bit, and she's been so on my side about it. Telling me she is glad we are not backing down, it's FI and I's day, we shouldn't let anyone change our mind. Then the other day she starts with "so how many of my friends do I get to invite?" I thought she was joking. None! When does the madness stop!