Wife's ex boyfriend and his wife threatening us

My wife had a affair before marriage. Now she is getting calls from his X boy friends wife and she is threatening that she has photos of my wife and will post it in social media as well as a legal action. I was trying to go mutually with my wife X husband wife but she is threatening me also. And saying that will send everything to my office resident etc.. now I want to live with my wife and having a kid also. But her X boyfriend wife is torturing me on daily basis like will post all the photos in social medias and blackmailing since from last one month. She is saying that she will not leave my wife to live with me. Lot of times i tried to close this issue by mutually but she is not agreeing. What can I do kindly advise. I don't want to disclose this issue to my family.