At some point in Season 10 , she becomes a U.S. citizen ( her lack of citizenship having set up some humorous situations in earlier seasons ) . In the first episode of Season 10 , Daphne and Niles marry in a small , private ceremony in Reno , Nevada . The rest of Season 10 and early Season 11 show Daphne and Niles adjusting to their new life as a wedded couple . Daphne and Niles have their first child , David , in the final episode of the series , " Goodnight , Seattle " . ( He is named after the show 's co-creator David Angell who died in the September 11 , 2001 attacks . ) A flash-forward scene in an earlier episode reveals that the couple will have two daughters
September 11 , 2001 attacks
September 11 attacks
Daphne Moon