Lost and need a solution...

Hi there, so I’m in a situation that has my fiancé and I constantly arguing about it.. so his dad had double knee surgery two weeks ago and has been staying at a rehab facility.. I don’t know if he is lying and says they are discharging him this Saturday because he is fine to leave and wants to come stay with us but to be honest I think he should stay and get the care from people who are able to help him. We have two small dogs that are pretty hyper and like to be around people, a 4 month baby and 5 year old who will be going back to school soon. We were told that he can’t be around dogs because they could cause damage to the incision and honestly i will not be locking up my dogs because he is around, to me that is not fair for them. My 4 month old has a hard time feeding with a bottle while I am at work in the morning and hubby gets frustrated with that already.. We also just found out hubby has high blood pressure and chest pains due to stress and I know adding on another responsibility will only add on more stress... I don’t have a great relationship with my father in law, due to many reasons... He likes to play the victim if he doesn’t agree with you or if he feels like you’re “attacking” him, he speaks to us like we’re children as if we don’t know anything. He always tries over step our parenting and buys/gives my 5year old whatever he wants without asking or a reason for him earning it. I constantly bite my tongue when it comes to him so I know if he stays with us it will cause some problems... he lives 2 hours away around other family but they don’t care to help and my sister in law put all the responsibility on us to figure out when she has no major responsibilities..

I don’t know what to do, i feel selfish but I’m just thinking about us and what we have to deal with already.... please help..