Aired: 1987-91 
DAD: David (?) (Dan Castellaneta) / Divorced 
DAD’S JOB: (?)
KIDS: Francesca (Tracey Ullman) (playing 13)
WHERE’S MOM?: Left. Didn’t wanna be a mommy.
STAND-IN "MOM": William (Sam McMurray) / Dad’s Significant Other
Okay, what if Dad’s gay, and he’s raising an almost-adolescent, braces-wearing 13-year-old with excessive energy? Oh, and your "show" is a segment on a comedy show that lasts maybe 11 minutes per episode, tops? You wind up with excellent writing, acting, and storylines that make the "Francesca" skits the funniest and most poignant parts of Tracy’s show.
Dan Castellaneta, of course, became the voice of the best-known Dad on television today: Homer Simpson.