Property inhritance

Dear Law Gurus, My grandparents have two children - one is my mother and the other is her elder brother. Grandfather expired, grandma and others are alive. My grand parents mainly have two property - one is an agricultural land (which is gifted to my Grandma by her brother, it is on her name) and the other one is a house built by my granfather (I don not even know on whose name it was, but now it is on my uncle's name). My uncle fradulently took NOC signature from my mother and changed the house to his name. My grandma is in favour of my uncle (obviously). They are reluctant to share the property. I would like to know my rights/My mother's right on this property. Kindly help me.