Although his family is vaugely referenced in the books, the Warren's are what got Frank thinking of making Greg more manly. The children of the Warrens are shown to be athletic and sporty, in stark contrast to Greg. In the third film, Stan, the father of the family, is one of the main antagonists, and is shown to be a neighbor of the Heffley's and has a childhood rivalry with Frank, that they appeared to have gotten over as adults. Greg finds out that Stan has been making fun of his father behind his back and came up with an elaborate prank to get back at him.