Wife's family cheating about her identity

Hello All, I have been married for 5 years and have child recently I have been going through bad situation with my wife's family since I suspect that they are cheating about their identity and family background with the help of some political background people and creating social disturbance as well in the work environment and in the society which even took us as level of mental harassment level and life of kid is under question since they are not properly taking care of him