person A: I'm anxious to meet my wife's ex-husband. Hopefully it will be civil and not awkward!
person B: I can definitely understand how you would be worried about that.  I think I'd have to decline - LOL!  You are a good person for being willing to meet with him.
person A: Yeah_comma_ there is a kid in the picture so we have to meet at some point! I wish I could decline_comma_ haha.
person B: Well_comma_ yes if there is a child involved_comma_ then you've got to deal with him at some point.  I hope it goes well for you though.