Property's dispute

My name is Abhishek from Warangal telengana This issue start on 2014 My father died on 2007 that time properly under in court after we released the documents the bank registered with my mother name Then after some say my mother registered property to his sister son for higher study's in London I and my sister and don't know when it's registered after we came to know after some days when we ask mother about she told truth . We went ask him after he refused to give us because it s sale deed register with his name we forced he agreed to return our property. On 2014 we went to registration office he came canselled registered with his name On that day my mother and sister brother in re planned register new documents 1. I have sale my half of share to my mother I don't have any right against property 2. We leave us went to my sister home staying with them 3.we are in same house since last 7 month 3.2019 my mother sold hole property to another person Now when I and my wife fight for any compassion she refused to give any money to us My elder son have mentally challenged My friends and family member telling that don't leave house until your problem solved . If registered person come send out what can we where we have to go. Please tell us proper solution