Nothing Given To Father From Grand Father

hi my father committed suicide 1 month ago because of bank loan . we are living on rent and we don\'t have money to survive and live. my grand father is not allowing us to live in their house they are living in a floor of 3-4 crores and they have a lot of money . my father and my grand father worked together till 2014 . we have proof for that. my grand father didn\'t give anything to my father and never helped him. before my father died my father goes to my grand father\'s house many times for help . two days ago before he died he goes to grand father\'s house for help but he denies that\'s why he committed suicide . we have proof that my father and grand father worked together and we have proof that my grand father have a lot of money . we are living on rent for 10 years . my father and grandfather were builders. recently my grandfather was living in a small and old floor but few months ago he bought a big floor and new floor in a good location . can you tell me what should we do.