Mary-Biff



Mary-Biff is Biff's baby daughter who appears in a 1989 episode of Sesame Street. In that episode, Biff, who was a father of four kids, gives Luis some advice on raising a child: fathers have to know how to say the alphabet and how to count, so they can teach their kids the same. They practice doing so, and Maria brings back Biff's baby daughter Mary-Biff, so he can demonstrate to Luis his third piece of advice: showing that you love your kids.