Television historians know that while the character of George Jefferson was introduced on All in the Family in 1971, he didn't actually show up on screen until 1973. As noted by The New York Times, the ostensible reason given was that he was uncomfortable walking into a white man's house, setting up the character as a foil for Archie Bunker's racism.
But the real reason was more pragmatic: Norman Lear had created the character for Sherman Hemsley, but Hemsley was under contract for the play Purlie and refused to break his contract. According to Encyclopedia.com, Hemsley had built a reputation as a powerhouse performer, and Lear had caught his performance in Purlie in New York in 1970 and knew he wanted him for the character of George. Rather than cast someone else, Lear decided to keep George offscreen until Hemsley was available.
Until then, Lear created the character of Henry Jefferson, George's brother. Portrayed by Mel Stewart, Henry got the lines and screen time that would have gone to George. At least, he did until Hemsley became available—Stewart's last appearance as Henry was Hemsley's first appearance as George. Henry Jefferson was never seen again.
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