Brad is Bert's nephew who appeared on Sesame Street from around 1978 to 1980 (seasons 9 through 12). Although Brad's speech and mannerisms suggest that he is between one and two years old, he is about half the size of Bert, making him appear a bit older.
His most prominent appearance was in a sketch in which Bert's attempts to give him a bath become hindered by Ernie's bath toy obsession (EKA: Episode 1134). He also appeared in a segment taking place in The Arbor, sitting inside a baby carriage.
One of several types of love that Bert describes in a Sesame Street Pageant includes, "When I hold my little nephew, and I bounce him on my knee, I'm smiling down at him, and he's smiling up at me. That's love."