Need information regarding partition suit

My grandfather died in 1960, and made an oral partition between his two sons before his death. Before the enforcement of oral partition, my father (his younger son) died leaving behind his wife and 3 children. Immediately after the death of my father, his elder brother refused to part way his share in the ancestral property. He claimed that since the largest chunk of land was on his name through patta hence there is no share of his younger on that. I have following questions; 1) is oral partition valid? Since I do not have any proof of the same. 2) My father's elder brother was only 7 years of age when he got patta land on his name. Being a minor is that possible? 3) Does my father has an equal share in patta lan 4) I have filled for a partition suit in a court of law. During the pendency of judgement, my grandmother made a gift of deed in favor of my cousins. Is it valid? 5) Can I make a request refraining defendants from making further gift of deed and sale of land Regards Manoj