Doubt in land property transfer?

Hi I have a doubt that For Ex : IF Mr. A has 3 acres of agriculture /non agriculture land property, where land is registered in A's name. So, after the death of Mr. A Who will be the owner of the land, his wife, son and daughter are survivers in his family Question : 1)Without the consent of one among the family, Can others be able to transfer to that other person,if yes in what circumstances(other than mental capacity of the non agreeing person) 2)with the objection of a single person in the family what is the ratio which it is going to be divided into Kindly answer the question