I recently set a date to go BM dress shopping with my maids, and I invited along my FMIL. She said she'd love to go, and was super excited. One of my maids is FMIL's son's babymomma (it was the quickest way to describe her, sorry). When I asked her if she could make it, she responded, "yes! your FMIL already agreed to babysit, so I'm all set, yay, so excited!!"
I was thinking I would just let them figure this out when the time comes, as it's really none of my business, but FI thinks I should call FMIL (technically his stepmom), and bring it to her attention. Agggh.. what would you do?