Want freedom from my abusive and quarrelsome wife

I am a 40 year old divorcee without children. Got married in 2007 divorced in 2011 on grounds of cruelty.Faced DV case till around 2014-2015.First wife's name is Rohini. Remarried a widow in April 2016 with a 10 year old son. Her name is Rekha. She was working before marriage as a nursery school teacher and is from a poor family. Her first husband passed away in 2013. Rekha is very close to her mother in law from her first marriage. In fact it is her first mother in law who took complete responsibility of our marriage. I am not sure but it looks like Rekha has an ongoing feud with her parents and siblings. Her own parents and siblings were informed about our marriage much later and were not even aware of our small bethrotal ceremony which took place in our house.All of them attended the marriage in a small temple There has been no interference from either her family or former in laws, at least apparently This is about the background. Now coming to the problems 1. Rekha has now been constantly throwing tantrums, blaming and complaining against me and my parents. Explodes when any real or imaginary harm happens to her son. Even the most innocuous ones are blown out of proportion, sometimes as simple as if my mother delays giving breakfast to her son. Any small glitch will escalate into a major conflict.She uses filthy language against my parents(cannot be described in words), not in front of them, but in front of me.Afraid that her son may take revenge on me when he grows up 2. If you try to show your anger at her for behaving so, she defends her statements and abuses initially, later sulks, speaks sarcastically, and possibly after many days may retaliate for expressing your anger. Any attempt to reason with her at this time will result in a tirade 3. In an attempt not to make her angry we are feeling extremely on the edge. It feels like being in a room full of hidden landmines. The tension is unbearable 4. *** Very important *** a. Answering her questions extremely tough b. Decides right or wrong based on her own yardstick c. Sticks to her decision resolutely and will not budge d. Interprets a situation according to her analysis and attacks the opponent e. Analyzes your behaviour and body language, words and even silence thoroughly and derives her own conclusions f. Does pre-emptive strikes.Believes in "offence is the best form of defence" g. Anticipates that we may blame her and does a pre-emptive strike to subdue us h. Will not hesitate to use bad language if she feels that the target person deserves it i. Speaks in crystal clear language as to why she is upset and why she is treating someone in a certain way. Impossible to counter leaving you struggling for words and aghast j. Told me that she has already attempted suicide twice and will do it again. Not sure whether this is true