Wife & in-laws not allowing me to talk to my Son & cooking false stories that he is scared

My wife went to inlaws on 2nd May for summer vacations & suddenly after 15 days I received legal notice for divorce & not taking forceful custody of my child from Ahmedabad family court. She has mentioned reason of mental cruelty citing drinking and abusing & false allegations of beating whereas I never ever raise my hand on her. Drinking also I do socially or at home quietly & never went out of control. We had a argument in March where we both abused each other & in-laws guided her without my awareness to collect all documents like salary slips, visiting cards, I'd cards etc which she was preparing entire April & I was totally unaware. Got to know this only when I received notice. After notice also since last 15 days I tried to reach out to her by friends and family but she is not buzzing and her father is only not letting anyone talk. My father in laws involvement in my marriage is too much & he get into my family matters daily by talking to her on phone & misguide her. Now court has given me time to reply in July first week. My query is now they are using my Son to emotional blackmail me & not letting me talk to him. Also teaching him again & again your father is bad and you are scared of him whereas he loves me too much and I am now worried about his mental trauma. Can I file interim custody immediately or I should file for it in July with divorce petition reply. As I m worried in two months they will brainwash my kid totally. Today is his 10 th Birthday & I m not able to meet him. Can I take help of police to meet him. What if they brainwash him daily & in court he says I want to live with my mother will court consider the fact that he was kept away from me for 2 months and they must have brainwashed him. Also why lawyers are saying you will not get custody as indian laws favour only woman.Also without my knowledge they applied for TC in school which I put on hold till my further communication to school. From 13th his school started should I allow transfer as everyone is saying if u file for interim custody also it will take too much time & I don't want my kids education getting disturbed. Pls guide