About cheat in govt jobs

He is working in collector office as a typewriter. after his father death he got that job on a petty cash quota in govt office. but the thing is his father who was borrowing salary 16000 no any business and nothing any financial well family but already have a property in posh area of andheri lokhandwala. including duplex 2 flates (both gave on rent 65000 and 45000 each), one family bar and restaurant( 3 lakh per month), 1 texi , one flat in mira road.two vacant flates for fitness center. and having a property in his village. but before joining the govt job there is one bond or as a form have to submit to govt. in that form there is a column in that asked a q any property details of ur family. he mentioned nothing more than one small 120 sq feet room in worli just that. and in bond paper he and his mother written as we have nothing more then any income source else then this job and that room where they are living in worli. it means they cheat to govt for getting job and as well as make a crime. so what is the procedure to caught them by law.