Should i divorcee or for Kids shake -- my wife threatened to kill and tried to hit me?

Long story short for first 5 years my wife has always praised how her brother in law has helped them $$ and always talked bad about her bhabhi....she cannot teach my kids 8 & 5 yrs. old for she cannot at times she cannot spell simple English words I told her to stop talking about other people and to improve her life and learn more to gain knowledge her response she has B.Sc and she does not need to. she talks and points finger for no reason at my family but if i do talk about her family then she took broom and tried to hit me and once when i she also told me she feels like killing me. She lies all the time i email her older sister who is about 50 yrs. old unmarried about our problem and how her another sister in Chicago has fuled the fire about wrongfully supporting my wife my this sister in law did not responded to my email which i wanted as proof. once my 50 yr old sister in law told me on phone it's between husband and wife and they don't want to get involve ( this is not true I know every day both of my sister in law talks to my wife and brain washes i know some times my son tell me the conversation my wife has with her sister) So i told my wife not to call any one in my family too at this time she gets mad