09-02-2018, 12:51 PM
Well, there's 20 years of relationship development we don't see between the episode proper and the epilogue. If, as G&K seemed to suggest, everybody ends up as one big, happy extended family, Nick might conceivably become Diana's "Dad," while Sean is "Daddy." We just don't know, and that was probably deliberate because at the time they were still hoping to pitch some kind of spin-off series.