Background: I live with parent in-law and one of BIL. The second BIL moved out just under a year ago to live with his then fiance now wife, who wanted him to be away due to dynamics of the in law family ( disclaimer: I tolerate his wife, I'm not fond of her due to her thinking she is entitled and makes it known when not bait)
MIL does everything for her boys and will go beyond to do it for them. ( Unfortunately this does not sit well with me as these are fully grown men that do not need infantalising)
Current Situation
MIL has recently been diagnosed with a condition that required daily treatment and means she does get tired and can get quite unwell. She has started this treatment recently and is now experiencing some symptoms
2nd BIL is due a minor operation on his ankle, he be able to mobilise with use of a boot. Him and wife planned he move back with us for 3 weeks while he recovers and she stay at their home.
My only issue is MIL will be picking up after him, and he is not one pitch in the house work let alone to offer to help. She has recently been having some side effects of treatment. I've also advise mil have her own bed and space should she want it and since she has been using 2nd bil room for this and has been working well for her. So essentially we have no spare bedroom for him.
I have managed to get husband and 1st BIL on board to reducing thing mil does for them and family to avoid fatigue. Unfortunately same cannot be said for FIL; think old skool dad and wife dotes on him. I work full time and commute 2 hrs each way and take time out for appointment when needed and do what I can to reduce her fatigue.
Is there a way round to reduce burden on MIL .Basically would it be unreasonable to ask his wife to look after him at their home so as not to burden MIl. ( I mean in sickness and in health 🫣😅)
Thread title amended by MNHQ at OP's request.
[Title edited again to clarify OP's AIBU]