It's been my experience that it doesn't work to be a peacemaker. I always found myself at the short end of the stick. Nothing was really resolved, or they resolved it on their own, their own way and I was ostracized.
Most times, when you try to give your side of a story, try to set your own boundaries, people MAY respect your boundaries but either won't or don't understand. Sometimes they'll even push those boundaries to test you or your resolve.
My ex-husband is the only abuser still alive and as long as I don't have to deal with him anymore than I already do, I see no point in saying much of anything. The only time I see him now is at two of the grandkid's birthday parties. He can take a long walk off a short pier... or not. I don't care.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.