From the Super Mario Wiki
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The Thang family (with their last name often abbreviated to T.) is the family of Jimmy T. who live in Diamond City, and appear in the WarioWare series of games. They enjoy dancing, and have even done choreographed dances all together. All members of the Thang family also have large colorful afros, red noses, and sunglasses. While not reappearing in the game itself, they all have a quick cameo on Jimmy T's character trailer for WarioWare Gold.
Official Profile and Statistics
WarioWare: Touched! website bio
Jimmy T's stylin' sibs, as if you couldn't tell. Disco diva Jamie gets the whole joint shakin' with her exclusive remixes. Self-proclaimed "chick magnet" Jimmy[sic] lays down a funky groove of choice microgames.
Names in other languages
James T. and Jamie T.