I tried to explain my own position to the C as well, that while I continue to have a hard time getting my mind around this notion that a child having multiple fathers or multiple mothers could be made to seem "normal" to a child, I do believe that peace is a desirable goal But I told her that a child has one mother and one father and that anything else just isn't normal -- and I seriously doubt anyone can prove it to be desirable or a benefit either.
And speaking for myself, I honestly do not think I could usurp or share the title and the role of another living father, even were I to marry his children's mother. And by the same token I cannot fathom that any woman with whom God decides to grace me in a new M should ever become a replacement for xW in the lives of my own children, not while xW is still alive. My S's already have a mother, just as they already have a father, and my marrying another woman should have no real impact on that.
But then I guess I follow the beat of a different drummer in that.