Blackmailing by wife

Dear Sir/Mam, This is to inform you that my wife is torturing me since the time of our arranged marriage..she and her mother both are the main roots of this torture. My wife did not respect me and my mother.. always keep demanding money and other golden ornaments and keep black mailjng us that she will impose the false case of dowry and will send us in jail if we refuse to fulfil her demands. My father recently expired because of her behaviour. Now she is targeting my mother. This is a recent scenario where she blame that I am giving all my earnings to my younger brother and his wife..which is absolutely wrong when I oppose she started talking nonsense that I have relations with my younger brothers wife (who is like my daughter). I have a baby boy 1 year old to whom she beats very badly and did not provide proper feeding she want me to leave the family and move to the city with her, when I refuse she started shouting, stop making food for me and my mother who is 55 years of age. There are several things which are happening on daily basis. Please suggest what should I do and help me before its too late.