“Sanford and Son,” when it had its premiere on NBC in January 1972, was a star vehicle for Redd Foxx, the king of bawdy comedy record albums, making his debut as a network television lead in prime time. But the show had two lead roles: the cantankerous California junk dealer (Mr. Foxx) and his long-suffering, hotheaded 30-ish son, Lamont, the older man’s business partner, who was sick and tired of being repeatedly dismissed as “you big dummy.”