A sister finds it difficult to get along with her step mother in law. The mother and father’s husband are quite healthy and able to look after themselves.The local scholars say that a woman is responsible for her husband’s house. If the parents come and stay with them, she is responsible for them too. Those scholars say that she has to take care of them like she will take care of her own parents.
This is not correct. Allah did not impose upon the wife to serve her mother or father in law. Actually this is an obligation upon their son (the husband). However, if out of Ihsan for her husband she is willing to help them, it is good. There is no obligation upon her.