If your husband is giving money to his mother to stay there, he can give his money to another landlord and find a small place for you both to rent.
Your accomodation options are NOT limited to either stay with his family or your family. As far as I am aware, rental accomodation is alot more easily affordable in Pakistan than in western countries, as in most of the salary is not spent on rent.
Find somewhere else to live within your means.
Totally agree.