I made him a babydaddy, my first sim's fourth child was Don's. "Let's see how Don likes having a kid, hahah!" I mostly did it for funsies. His son turned out really cool (and he didn't inherit his father's small eyes, I'm glad for that... what he did inherit was Don's pouty butt, which he himself passed on to one of his own sons, perhaps the Lothario-butt will continue for generations), and Don got eight grandchildren because Don's son loooves the women (and I didn't do it just because he's Don's kid, it just happened). Don was actually a really cool father and grandfather. He also seems to flirt with a bunch of ladies - when I go to a lady sim I haven't played with for a while she very often happens to have a romance bar with Don even though I never saw them meet.