Inherited property: what are my rights?

I am a married female Hindu and I have two children (one son and one daughter). I have inherited a house (self-acquired property of my father) with absolute rights from my father as per his Will. I want to know whether my children will get the rights over this house automatically. My children want to sell the house and want to purchase another property against my wish. They are claiming that it is their grandfather's property and they have right over this house. I want to know whether grand children get the rights automatically over their maternal grandfather's property.