Very long story short, my wife and sister in law used to be extremely close, several incidents have happened and now they are at the point of never speaking again. I have already stepped in once and pulled thing back from the ledge. The most recent issue is over an act they see eye to eye on, but disagree with the handling of the aftermath of the act. About 9 months ago, the sister in law's kids were staying with their grandma(their mom) and step-grandpa, and step-grandpa disciplined the kids by spanking them with a single swat each with a belt. Both my wife and sister disagree with the use of a belt. My wife thinks this could have been solved with a conversation( I agree completely), and the sister in law has gone full on nuclear, never speaking to the stepfather, kids can't be around him, etc.... She has recently even gone as far as cutting ties with both of us because we don't "support" her in her irrational quest for retribution for "her boys". My issue is twofold. I would rather have absolutely nothing to do with the mental midget of a sister in law, but I also want to support my wife, and she still wants to see our nephews. I also would love to speak my mind on the issue, and I really don't care about effects. What should I do? Should I continue to suck it up and drive on because I love my wife? Or should I do what my first instinct is and verbally eviscerate this mental midget and cut my losses? I know that being logical will not get through to the sister in law, but I know I will feel better once I speak my mind to her, and it will be less polite than the last time I stepped in and said something.