Rowley Jefferson's Awesome Friendly Adventure: Jeff Kinney (Rowley Jefferson’s Journal)
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Aunt Cakey is Susan's oldest sister. She is single and has no pets or kids, suggesting that she doesn't like kids. When she stayed with the Heffleys when Greg was little, she kept all fragile items out of his reach and made him take a nap. When she told Greg to not touch the iron, he couldn't stop thinking about it and pressed his whole hand against the iron, giving him a second-degree burn. Susan has never trusted her with babysitting since. Martina is Susan's cousin who had gained a lot of money while in Las Vegas. She had been eating at a breakfast buffet in a hotel, when she mistook a full-length mirror for another room, causing Martina to run straight into the mirror, break her collarbone, and sue the hotel. Greg notes that a Porsche in Gramma's driveway was probably hers. He is the main character of his own spin-off called Diary of an Awesome Friendly Kid, which also had two sequels called Rowley Jefferson's Awesome Friendly Adventure and Rowley Jefferson's Awesome Spooky Stories.
He shows little interest in sports until Dog Days, where he is found playing tennis with Rowley and golf with a caddy. When it's his birthday, he goes to childish places and invites kids in his karate class who are half the age of him and is happy even when he gets childish toys. In Old School, it turns out during the events of The Ugly Truth, Rowley had a birthday party at the Old-Timey Ice Cream Parlour. He is also a fun, loving boy, that a lot like more than Greg usually. He is a good friend of Greg and despite the fact, Greg often uses him (carry his stuff, give him piggy-rides, write English work for him, and scout for dog droppings) he still doesn't question or go against Greg and is willing to be much like Greg. Rowley is quite immature and seems a bit naive which Greg takes advantage of him by manipulating him, but he's charming, cheerful, and innocent nature makes him more popular with other students (particularly the girls) than Greg. His friendship with Greg is arguably more legitimate and developed in the films than in the books. Likewise, Rowley intends to help other whenever they need it. In the novels, Greg primarily uses Rowley for personal gain and always pushes him around, though they are legitimate friends nonetheless. In Diary of a Wimpy Kid: Dog Days, he smashes "The Muddy Hand", which is really Greg's hand. He is sometimes an enemy, but most of the time he's a "good guy". Rowley has a pure soul and knows that Greg loves him deep down.
His journal in Diary of an Awesome Friendly Kid is most likely a different one from the second book.
Arthur Heffley is Greg's great-uncle. He only speaks in grunts or makes random sounds. He never has an actual conversation with anybody, but sometimes Greg tries to respond to him just in case he is trying to communicate. Arthur is the brother of Reba, Grandpa, and Loretta Heffley.  Great-Uncle Bruce [ edit ] Cecil is Greg's adopted uncle who is only three or four years old. He was adopted by Great Aunt Marcie, and Greg often feels awkward around Cecil, due to the fact that he gets privileges such as sitting at the adult's table at family gatherings, despite his young age. After Greg inadvertently causes the Snella family to move away due to a foul smell which (unknown to the Snellas) was caused by Greg dumping deviled eggs into a plastic plant, he decides that he should find a way of sneaking deviled eggs into Fregley's house.In the film adaptations, Rowley's mother is portrayed by Kaye Capron in Diary of a Wimpy Kid (who in turn is the real-life mother of Robert Capron, the actor who plays Rowley) and by Bronwen Smith in Dog Days. Gammie is briefly mentioned by Greg in Cabin Fever when he says she gave a miniature carousel that held spoons from all over the world to Greg's family five or six years before.
Rowley has what Greg considers strange interests for his age and gender, such as loving a singer for "six-year-old girls" named Joshie and action figures Greg believes are for younger kids. Rowley is also the owner of the comic strip Zoo Wee Mama!.  Rowley claims that Greg had nothing to do with the comic strip in the first book, a rare antagonistic move from him.Lawrence Heffley is Greg's uncle who did not appear at Uncle Gary's fourth wedding because he is always traveling. He is said to almost never come to family gatherings because of this, but he sometimes makes an appearance by webcam.