Joe Heffley

Uncle Joe or Joe Heffley is the younger brother and rival of Frank Heffley, brother-in-law of Susan Heffley, and uncle of our protaganist, Rodrick Heffley and Manny Heffley and a supporting character in the series.

Role in Rodrick Rules
Joe comes to Greg's house late for Thanksgiving. His children all call their uncle "Aunt Fwank (Frank)." Susan says that this is cute but Frank says that Joe taught them to do that. When Frank goes down to the basement to do edits to his Civil War diorama, Joe sneaks down and says "Nice toys, big brother!" Frank explains everything to Joe, but Joe didn't listen to a syllable he was saying. Greg mentions that the year before that book takes place, Manny was approximately 2 weeks from geetting out of diapers, but Joe puts a stop to it by saying "Watch out for the 'potty monster,' little fella!" Everytime time Frank had to change a dirty diaper after that, he swore under Joe's name.

Role in The Last Straw
Joe makes a brief appearance in the Easter church scenes. Greg says that when the songs start, he holds Greg's hands, even though he doesn't have to. Greg also says he has an iron grip.

Role in Dog Days
Greg says he asked Joe to encourage Frank to buy a dog. Joe slaps Frank's back saying "A boy needs a dog!" Later he is at Greg's birthday party and his dog Killer eats some of Greg's birthday cake.