ABOUT Family and property

I m discussing my whole problem with you... some year ago my grand father made their ancestral house so he want some money from their sons to build that..he had 5 sons and one daughter..my father gave him alot of money to build that...and some 5 years ago my grand paa gave my father a land as gift deed.now my grandpa for his sake want that land back..but my father didnot want to return ...grand pa tries hard to get back that land to do injustice with my father..bcz he want money evrytime from my father and my father gave him.some day ago my Father"s sister got sick and about to dead for some heart diseases and liver problem for that my father gave mostly all the money and treat her..my father's sist had no relation with his husband ..she stayed in our ancestral house..my granpa some year gave all the property to that sist and his younger son but for some reasons he return them back. .other son gave only a little amount of money tohim..but some days ago my father refuse to give money..fr financial prblm.and now my grand paa told my father that he will abondon my father ..and Get out him from evry property he had..and also from ancetral house..plzz tell me what should we do..?can my father took some action ..? wht is it