FMIL wants to substitute 2 of her invitees as one had passed away over the summer, leaving his wife widowed but she is still invited and the other has been extremely ill and "probably won't be better in 3 months for the wedding" (her words - how the heck does she know?!). We told her NO as the invites were final and if we allowed her to "substitute" then my parents should be able to etc. She then asked if she can invite the 2 "substitutes" if we don't make our minimum. We told her that we will be giving our single bridal party members first dibs on bringing a date as well as my single brother (who is not in the BP). She didn't like that answer and said that she should be able to verbally invite more people if we don't make our minimum.
Is there a such thing as invite "substituting?" I mean, seriously. Agh. Any tips/advice would be greatly appreciated.
ETA: Our guest list is currently at 168 and our minimum is at 140. I have a feeling we will make minimum and not have any substitutions.