Part one of Mad About You's series finale is set approximately 22 years in the future. Mabel Buchman (Janeane Garafolo), grown-up daughter of Paul and Jamie Buchman (Paul Reiser, Helen Hunt), follows in her dad's footsteps by producing a documentary film about her family. The starting point is the startling revelation that, thanks to a genealogical snafu, Paul and Jamie were never really married. Originally telecast as an hour-long special, this episode has since been divided into two half hours for syndication.
by Rovi synopsis