Harrasment from wife and her parents (mother & father)

My parents stay on second floor(owned by father). I stay on 1st floor owned flat and wife is nominee on agreement. I pay the total emi. my mother is 67 years old and my father is paralyzed and 75 years old. I got married 4 years back and have 3 yrs daughter. that's why my inlaws are staying along with me and wife to take care of daughter. my wife is too much short tempered and her parents too. last time I was drunk and had silly arguments with wife. my inlaws filed a NC in police station. and on next day called a lawyer and all my relatives and took a wrriten note on stamp paper signed with their lawyer from me saying I wont arguive also and if I do so I will be arrested. Now on this ground my inlaws are blackmailing me for every small reasons. they are also threatening me to complaint in my office to HR and make sure they will make me loose my JOB. My wife gets hyper for any small reason and big arguments and shouts happen in my residence. I am really fed up of this. My wife and in-laws says they will never give divorce and stay permanently at my place even if they think of divorce. My demand is to keep my daughter along with me but she is 3yrs old only and there's no one to take care of her, that's why they know my parents may not be able to take care because of old age. my in-laws say if I need a divorce they need half of my property and half of my salary. and if any silly arguments happens between me and my wife they just threaten me blackmail be. they say they will not go out from my house as they don't believe in care takers, Kindly give a better solution for me. My wife is working in Bank not ready to leave job for kid care taking, and I am engineer working with MNC. please help. does voice recording of arguments will help ??