Need justice

Namaste Gayatri here I am widow and have two sons aged 19 & 17 yrs living in Chennai. My late husband(died on 17 Jan 2017) who worked as HC in TN police and has three properties ie 1. Land with building: 567 sqrt in mandevali chennaisettlement deed from his father(partitioned land of their family members) on 2004(mentioned after the death of in laws son and his heirs have rights to sale etc)2. House site :1800 sqft my husband acquired property on his name itself 3.agricultural land:0.25 cent settlement from his father but all rights given to son and his heirs and have no rights to him TN police dept nominee was in my name so pension is coming to me . My in laws got the gpf amount. My husband parents STOLEN th original documents of my husband property Mother in law had made a settlement deed to her daughter of the above properties on 30 AUG 2017. I came to know now only. I and my sons are facing a lot of difficulties for our livelihood no shelter of our own,for children's education etc. We are CHEATED we don't know what to do. I don't have any finance to go to court .please help us