Susan Dey, AKA 'The Partridge Family's' oldest daughter Laurie, isn't on Twitter. So, don't bother trying to figure out why she skipped the Tuesday morning family reunion on the 'Today Show.' Nobody knows. OK, maybe producer beau Bernard Sofronski knows, but he's not on Twitter either. It's time to face facts. Gathering television's most famous families in one room is darn near impossible. Not that onscreen sibling Danny Bonaduce cares...