Is this a case of child abuse

My mother died while giving my birth. My father married my maternal aunt later under the pressure of circumstances. I lost my father at the age of 10 and was raised by my stepmother. Only my stepmom and I lived in a small flat owned by my father. Two years after his death, she started being close to a middle-aged local shop owner (quite an uncultured rough guy), who started visiting our home regularly in the evenings. I eventually saw them one day in a compromising position which shocked me very much. However, I did not react and pretended that I did not understand anything. I was in class 7 then. This continued as I started going to different tuitions and coachings from class 8. I got enough evidence of their physical relationship (condom pack). Although I was in severe pain, seeing how after 2-3 years of my father's death this woman converted our house to a brothel (till date she enjoys my father's pension), I kept my silence fearing my own future. I was very good at studies and focused myself there to move out of this hell eventually. Throughout my school days, I went to bed with a suppressed fear that I would be murdered in my sleep. Their relationship continued as I completed my college, university - until my marriage. I did not see this man after my marriage. Also, I moved out after marriage. We live in a different city and have one kid. I could not tell anyone about this shameful past and all these years, tried to pretend that it is like another normal family with some usual tensions. Today, I think facing no challenges those days has made my stepmother bolder. She now keeps interfering in our lives, criticized us in an unfair manner, which becomes intolerable for me. Just for the sake of my family, I still maintain silence on the dark past (which includes my inaction too), but I now started thinking about officially cut the ties with her and exposing her real character to all. In this regard, I want to know whether my childhood sufferings can be brought to justice. Does indirect mental torture over the years amount to a crime in IPC? Is it possible to accuse her of events of long past? Or, would it take an ugly turn against me as a conspiracy to malign her character as I have no hard evidence?