nothing given to grandson after father''s death, what to do

hi my grandfather and grandmother didn't gave me anything after my father's death my father and my grand father earn together actually they both were builders my grandfather and father got separated after few months when my father got married and my grandfather didn't gave anything to my father at that time although my father have earned them a lot of money . my grand father and my grand mother are living with their daughter and her son actually her daughter got divorced . me and my father and my sister and my mother are living on rent for more than 10 years. my grand father haven't supported my father till that. they are living with their daughter and son but not supporting us . after my father's death we don't even have a house and no one earns in our house . do I have any rights in my grandfather property? or we can say my father's property because my father earned those money by working a lot with my grand father but that property is registered on my grand father.