Fake Threats to file case against me from my wife's family

I am 29 years old software engineer from gujarat. I got married in Jan- 2018, My family was looking for a girl who can take responsibility of my house and she must be able to do all routines as a house wife. So before marrying I clearly informed my in laws that, will your girl able to do house hold work. and at the time of marriage they said yes. Before marriage they said my wife is 12th pass and 18 years old and we all agreed. After marriage I came to know she is 26 years old and she has not completed 12th. she failed in 10th 4 times and in 3 time in 12th. she is not able to read our mother tongue Guajarati as well. And moreover, till I came to know about her she was expecting with 4 months. I was so upset, so I decided to educate her. I convinced her to give 12 exam and if she gets success then she can go to college as well. I did all the expanses and put all physical and metal efforts on her. My in-laws didn't help me at all and they said now its your responsibility . after one year she again failed in 12th and now she denied to come to my home again. she wants me get separate house for her and leave separate where she does not need to do work for my parents. My father is on bed and mother is house wife. through out this journey, my wife never did anything for my father. She does not even know how to cook. some time I feel she's mentally challenged girl and my in-laws has frauded me. But now I have a son. right now my wife is with her parents since last 6 months and forcing me to leave separate. She does not want to study and doesn't event want to do house work. I never abused her, in-fact I always motivated her and helped her in all her needs. I never asked for dowry and they did not give anything. Now they are threatening me if I don't get separated they will file a case against me, they say "ladies ke kanoon bahot bade hain, jail main dalwa denge pure ghar ko". On of my in-laws is government servant and he is saying "Police mere ishare ki rah dekh rahe hain, pure ghar ko utha lenge"... I am white color professional guy, never seen police station and never did anything wrong. But I am worried about their threats.. Please help me....