Equal share for married woman who got married before 1985

My mother's parents both have passed away. There is a house surrounded by plots left behind. I have 2 questions: 1) My grandmother had left out a will worth 1 ground to one of her daughters and she has mentioned that her daughter can use that land, build a house, her sons upcoming grandchildren can use it. She hasnt mentioned if that daughter has the right to sell it. However now my uncles seem to argue saying that nobody had signed in this will document and hence it doesnt carry value. Is that so? 2) The second question is, one other grand daughter (grandma's son's daughter) seems to take the lead always explaining that only son has equal share in his father's property and one part would be given to daughters and they should all share it among themselves. For example, 1000 sq. ft land, if there 3 daughters and 1 son, son takes 50% share say 500 sq.feet and remaining 50% (500 sq.feet) has to be sahred among all the 3 daughters. They also say that the married daughter can claim equal share only if she was married after 1985. Can you please clarify? Thanks