Property partion

Namastha sir ! Father expired 2002 and I got married 1986, my given me through thanasettlement (gifted property) . And his death unexpected, before his death he also registed land to my brother. Me and one brother and my mother is there still now. After his death my brother and my mother sold so much property ( after 2002 to many people and also given property to one college and taken a share by giving father land without my signature. ).still there is property on my father name . Things I want know is 1. My father acquired land from many people so many survey number land . Only surface level I know the boundry of the land . 2. My mom and brother sold different people (one person purchased land from them and formed layout and sold different people, other one to college) 3. I am not rich I need of money wen I ask my brother and mom , they humulated very badly , now I want claim my rights, pls guide me how to I take all this documents and suit the case for partition for remaining property which on my father name? Is there law allow me to suit on property they sold ? If I suit each of layout people I will win or how to handle layout people and how to suit against the college? ,