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Matthew "Matt" McGuire is Sam and Jo’s son, and Lizzie's younger brother. He is the minor antagonist in the Disney Channel show, Lizzie McGuire, and a minor character in its movie, The Lizzie McGuire Movie, portrayed as a scheming, witty, cheeky, young prankster who goes to extreme lengths to continuously annoy and irritate his older sister Lizzie, and sometimes his mom and dad. He is friends to Lanny Onasis, his best friend, Melina Bianco, his girlfriend, and is also friends with Lizzie’s friends, David "Gordo" Gordon, and Miranda Sanchez.