Conflicts with SIL under same household

Why not just talk to your SIL’s spouse directly and make a certain arrangements? Has she been always like that or only after giving birth? I heard some mummy avoid their children after giving birth like going through some kind of depression .. I don’t know but maybe try to observe her and then talk to her spouse and understand how PIL feel first.. for all you know, maybe PIL is enjoying taking care of their precious little one at least the baby gives them something meaningful to do and a purpose in life ?

Well it should be put across to her with this such attitude. Pretty much unacceptable. They could have ask your PIL to go over her hse instead of they staying over at ur place. I mean why also in the first place make love to have a baby when you can't afford to care for one baby? I mean let's be fair and equal to know that PIL is just an extra helping hand not to do everything for us. Hope this solve quickly for you so you can have a peace of mind.