Misbehaviour by wife and in laws

My case is little revers, its been 3 years of marriage and we have a 2 years daughter. we are bearing good relation but when ever it comes to family talk , she gets hyper, My wife doesn't have good education which comes out in her language, me find it bitter too but any how i am managing. Worst is my in-laws circulate false rumor about my family character like my mother & sister always tries to domiate, my father (68 years) put wrong eye on her etc, despite in 3 years she hardly lived there 6 month. Most of the time frame of this 3 year, she spent in her mother home. Their mama's who resides in Delhi also tries to make me bound to follow what ever my wife says, they force me cut off with my parent who lives in patna, how i can leave them when they need my support badly, my mother(68 years) always remain ill. My in laws use to threats that if i don't follow they will put my family in dowry act, on of her mama is in police too, they always take there name and try to put pressure on us. Please help...