How to resolve family issue and increase cooperation within family

I am a house wife my husband native belongs to , whereas due to some financial issues i settled down in my fathers house along with my husband after my marriage. Now my father in law is living with his daughter my mother in law expired two years ago and he had a unmarried son who recently passed away who was living with my father in law. so many years my father in law was living separately till my mother in laws death and his son death along with them. Now he is living with his daughter. He is getting a pension of 25000/- per month. We have one daughter who is going to be married. My husband sister (my father in laws daughter) is not giving a single penny to us. What we have to do. My husband is having one more brother. Even though they take all the money, for the death rituals and other things they need us. But when coming to money they are not giving a single penny. We asked my father in law to come and stay with us. He is not giving proper answer. Please advise .