Government servant hide his age and continue job over 6 years

Good Afternoon. From one of my family friend I got some information about my would be father in law, just 3 days before. The fact is : 1. He (would be father in law) is now 71 . He is a retired state government employee of West Bengal State Electricity Distribution Company Ltd. 2. He got his retirement on September 2012 on the age of 60 (Recorded in Service Book). But Other Documents , i.e, Voter Id, PAN Card, Doctoral prescription and other medical records shows the accurate age . And when I verbally ask about the matter, his wife and other family members also agree with me that they know the truth but casually enjoying the financial over earnings etc. 3. Now my question is - (i)How to lodge a complaint against Him and his family? (ii)Is it necessary to break up the Marriage Proposal? (iii)What is the other legal procedures? (iv)I am a GOI servent. Is there any chance to hamper my professional career? (v)If circumstances come to marry his son. then any financial bindings come to me?