1985 were written out of the show in 1986, and no  explanation was ever given for there whereabouts (many probably  assumed that both Buzz and Sonja went to college and lived on their  own). In the 1990 season, when Vinton wants to have another child,  he says that if its a boy, he will name it Vinton Jr., forgetting  that Buzzs real name is Vinton Jr.