We've had this happen the last two times and I'm pretty bummed! My ILs offered to watch both girls a while ago but then the day came and went and they made no mention. We figured they decided they couldn't handle both kids and didn't make mention.
BIL and his gf were supposed to watch them Monday night. But BIL got sick and his gf had just watch another toddler and baby solo overnight. They made no mention on Sunday when we got together so we didn't bring it up.

Kinda bummed!!

How would you go about bringing it up in the future in scenarios such as these? We've never asked my ILs because it's really just Fil so we know it's a lot to ask. They actually kept offering so we took them up on it. Then they didn't follow through.