Yikes! Sounds exactly like my wedding! I have a big family, and my sister planned a really fun casual shower for me and invited all the ladies from my family, plus my sister in law (to be) and MIL (to be). Well, neither of them could make it, so then my mother in law went and threw ANOTHER shower for me, a suprise, hoity-toity tea party shower complete with cucumber sandwiches and the whole nine yards, which was completely not my style. There were all these distant relatives from her family and friends of hers that I didn't even know and my mother and sisters were NOT invited. I appreciated the gesture, but it seemed like it was more of a i'll-show-you-how-to-throw-a-shower type thing.
Anyway, I would invite your FMIL anyway, and if it's that important to her, hopefully she can make room for it in her schedule. If not, so be it. You can't plan it around one guest's schedule.
Anyway, I would invite your FMIL anyway, and if it's that important to her, hopefully she can make room for it in her schedule. If not, so be it. You can't plan it around one guest's schedule.