Change of proprietor in business q

Hi,

We have our family business ie jewellery shop with the proprietor as my father and my father expired recently. My father in laws want to change the proprietor name as their name. Currently they changed the proprietor name to my mother name. As we are the legal heirs of my father, Without agreeing all legal heirs of my father is it possible to change the proprietor name to their name? Fyi, we have legal heir certificate issued by court.