Property

Hi Experts, My grand father had two wifes. He married W2(own sister of W1) when W1 is alive as she dont had any children. After death of my grand father both (w1 and W2) filed a suit in 1980 againt another person (my grand father's father's brother's son) and he agreed for partition so it is divided b/w w1 and w2(had judgement Copy). After death of W1 total land is moved to W2. W2 had two daughters. D1 married and had two children and took care of total mother's family responsibility. in order to get marry to D2, D1 sold her husband property. Total village sits and decided to do that and W2 also accepted to give complete land to D1(As she sold her husband property and to get total land in one servy numer which is easy for cultivation). As promised W2 registered her 70% of property 10 yrs back to D1 and D1's son as gift and remaing 30% to D1 recently as sale.Unfortunately D2 expired now,D2's sons filed suit for partition saying W2 is illigal marriage total registration has to be cancelled and shared b/w (D1 and D2's Son(D2 expired)) as they are legal heir of my grand father. I am D1's son can you please advise. we had sold my father's side property which is exactly 50% of grand mother propery. we had to get 50% from my grand mother property by law and 50% as exchange for which my mother sold for her sister marriage. Total village is ready to come to court as witness.sorry if it is confusing. Thanks in Advance