Parents involvemnt

Dear Sir, I got married in 2014 and i have son of 1.5 year. My father in law continuously emotionally and mentally harasses my wife and always diverts her mind to get back to her, as there is no one who handles to responsibility of cooking and daily home works. He always tourches her that we have given birth to you and took so many loans to marry you now you should spend some time with us and help us for cooking and all. Everyday he calls for more than 1 hours and cries over call and my mother in law also cries over call to get her back for support. Due to same; for small reason she left my home and they are planning for divorce to get alimony so they can settled economically and no need to earn money in this way. I dont want to divoce her as my son is with her and there is no future of my son with as they are almost baggers. Why should i pay from my hard money to them for their free enjoyment !! I will commit suicide but will not give a single amount of money to them. Why should i work hard earn money and give to them???