Threats given by wife & her parents

Hi, I'm seeking advice that what should someone do to safeguard him & his parents when his wife gives threats to commit suicide or 498A, using very abusive language to his parents & even grapple with him. Her parents also supports her & giving threats to file case of 498A & domestic violence..Only demand/wish is to be separated from his parents.. It's my own case. I'm living with my father,(mother is no more) wife & 3 years old daughter..got married 4 years ago but half of the time my wife spent at her parent's home as problem started just after one month of marriage.. Initially, her father took charge & tried to teach her..but mother continuously motivated her to get separated..now her father is also not giving response & favouring her..we had meetings 3-4 times in presence of elders.. every time wife felt sorry & we compromised..2 years back they filed case of 498A & domestic violence at women cell..but women cell incharge found nothing in complaint & again we had compromise..now again wife & her parents are giving threats on regular basis so that I may get separated from father but I can't leave my 66 years old father in any case.. I'm only son..I'm ready to leave my wife instead as I'm fed up now from her threats & most importantly, her abusive language.. this incident happened just 3 days back & now my wife is in her parent's home for some marriage function where I'm also invited but I'm not going..things were normalised 2 days back & now we are talking on phone once/twice in a day for just 1-2 mins.. Pls suggest what should i do to safeguard myself & my father in any mishap..