My friend’s inlaws are like that too. They dont even bother throwing wrappers in the dustbin.
Her MIL works. My friend and her bhabi cook, and they are told what to cook, and they cant even make large batches of food to use it the next day. Gets very tiring. The bhabhi often gets into arguments with the MIL on these and some other issues. Result? None of the inlaws like her.
But my friend never argues. Does what she is told. Result? Her husband loves her even more now, and is very supportive of her. They might even move out in a few years.
Sabr ka phal meetha!