Fragile In Laws

So this is a hard question... my in laws are 66 and 71, but they’re both recovering from something. My FIL a hand surgery and my MIL a fall on her bike. She’s clumsy and he’s an old 71 if that makes sense. They’re coming to visit this weekend and my husband is keeping our baby home from day care so they can all hang out on Friday. I’m fine with everything I just get concerned that he’s going to leave them with the baby and honestly I don’t trust them to not let him fall off the changing table. Lifting him and everything too is a concern. They’re not used to it and not as quick on their feet as they once were. Any advice on how to relay this info to my husband and my in laws without sounding like a biotch? Thanks!