I am a young male of 29. When I was 12 and my sister was 10 my father left us and married a nasty woman in a different city. Financially we were sound with my mother's own ready-made garment business. But when I became 18 my mother wished to see me nude and one day she aroused me to have sex with her which I am doing till date. 

Meanwhile six years back my sister was married to a businessman's son at Jodhpur where she was forced to have sex with all four brothers including her husband. After spending three succumbing years as they liked she any how managed to be back to us and is now living with us. One night she saw me fucking my mother where after she expressed her horny feelings to me next morning. I also fell week to see her attractive young body and had a sex relation with her too. When it came to the knowledge of my mother she could any how agree looking to the sad plight of my sister and since then I have been fucking both mother and sister alternately almost ever day or night. 

But last year I was married with a beautiful lady of 26. She is quite sincere and devoted to me. After she detected my undue relation with my mother and daughter she has had great disappointment and she always asks me why did I marry her. Although gradually I have reduced my frequency to fuck my mother and daughter so less to copulate with my wife at least once daily in the night. But how to do full justice with my wife. I feel pity for my mother and sister too who have no other option. Their life will be barren if I completely leave fucking them. 

Guide me please what to do?