Share of a house owned

My house is been registered under my father and my grandparent's name. My grandparents are sick and so i have a question related to it. My grandparents have 3 children all male including my father. What will happen to the house after my grandparents dies? Do my other two uncles will get the share of the house whose name are not registered under the property. I want to clear it out that along with my grandparents my fathers name is also registered in the property names as an owner of the property. 1) So what will happen after my grandparent dies? Will the other two brothers will get share of the house? 2) The house is also registered under my father's name so will my father get the whole share or he only gets what he already owns or after his parents demise he will get the share of what his parents own and it will be distributed to all 3 sons equally? So as if my father will get the share already in his name and also the share which my grandparents own? The other two brothers of my father doesn't stay with us, they don't even visit their parents as in my grandparents so what is the legal option so as they don't get any share of the property after my grandparents demise?