Widowed's right to live in shared property of father-in-law.

I am widowed, husband expired six months back. Father-in-law forcefully evicting me and I am living in small store room with my son, where our life is like a hell. My husband made a room on the floor, and currently a tenant is living in that. Previously my husband used to take the rent, but now my F-in-law taking the rent. The property is in the name of my F-in-law. My F-in-law had field a "bedakhali" case against both of his two sons. My devar (b-in-law) still living in the same house with separate room kitchen and bathroom. My F-in-law forcing me and my son to leave the house saying we are "bedkhal." I have no source of earning, no other property, nor my parents are poor. What should I do. My son is in 6th grade, F-in-law not ready to given fee or any money for us to cook food. It is large big house, but I am living in a store room, not having bed, almirah or anything, no water supply in it. He wants us to leave or live in this way. I got married under hindu law.