Wife's Aunt marries wife's former statutory rapist

My wife and I have been happily married for 25 years. We met in high school dated and got married. I had not had any sexual relations with anyone other than her. Prior to us dating she had really liked this one older boy as a young 15 year old freshman. She chased him a bit went out on 1 date they had sex and he dumped her. Fast forward 20 years a couple kids and all that go with it and my wife's aunt who is about 5 years older marries this guy. Its her third marriage. I'm not thrilled about the situation, I really don't want to see this guy at weddings funerals thanksgiving etc. Especially my kids weddings graduations. I would prefer to just not have any interaction with them at all, but whatever its not that big of a deal. The problem is her aunt and one of her friends try to get me to interact with them, nothing crazy just hello and conversation, and if that is all it was it would be fine. They know I'm bothered by this though and try to instigate me. For example when the aunt was getting married the friend called me. I do alot of vacation planning and she had asked me many questions about different places and how to book. I spent alot of time helping her and getting things right and at the very last part of the conersation was well this is X and X's honeymoon so I'll have to let them decide. Que the 2 instigators laughing there ass off because I planned there honeymoon. Its an immature game for them to try to irritate me. Im in favor of just cutting all ties. Im damn near 50 and tired of the Jerry Springer bullshit. Any advice?