Mentally & Financially Harassed by Wife

Hello, I married a girl who wasn't financially sound but it was love at first sight for me. I decided to marry her after taking her consent. I took the financial responsibility of her family too as she didn't had her father, mother is deaf and dumb and brother was unemployed and Divorsed. I made her brother partner in my company. I purchased a home for her brother on his name. After 1 year of marriage when her family was capable enough she started doing mysterious things. I give her good pocket money every month but still she demands for more for household things and for her maintenance charges(which i have never seen). On other side her brother learned all business techniques from me and after 5years he opened same business and started working with my parties which have led me to several questions in trade but I remained silent. Today after 9yrs of my marriage i do not have any kid. I spent a lot in different treatments for my wife but all in vain. Whenever i tried to sort the things her brother was always a hurdle for me. She give me every day mental torture with abusive language and demanding for money. She also threaten me by saying that she needs divorce. She make scene in my neighbors too which hurts my self respect. I many times tried to have healthy talk like how may we live happily. On her suggestion I even opened a boutique, let her join gym to remain occupied but that also didn't worked for us. As she take money from me but ever joined it. My everyday starts with new mental torture. Now that i am fed up being silent from years and i want peace in my life i want some legal advice on what to do?