Property Succession

My father passed away three months ago. The house that my mother, brother and I live in is in the shared names of my father and his brother. My mother is the nominee along with my grandmother. However, my uncle, who co-owns the house with my father, is refusing to transfer the house into my mother's name. Is there any way to change the ownership to my mother's name? My mother is a housewife with no job, and the house is our only asset, while my uncle owns two other houses.