My ex has sure surprised me, at how little he has visited.
He was such a good dad, changed lots of diapers, put toddlers to sleep, took them places, played with them, ect.
Since I left in Oct 03, he has seen them for 3 weekends, about once a year.
He shows up, buys them lots of junk toys, and figures he is done for the year.
I don't think I'll ever understand.
My boys call the ex Papa and my new husband Dad, is there another name that your fiance would be okay with? How upset will your ex be if there is another dad? I don't think it really matters if your fiance and your kids both want to use dad, but if there is going to be a major blow up from your ex, I might find an alternative.