Franklin "Frankie" Nathanial Jonas is the youngest Jonas Brother. He was born on September 28, 2000 in Wyckoff, New Jersey. All though he is not in the group his brothers: Nick, Kevin, and Joe call him the "Bonus Jonas". Sometimes he is called "Frank The Tank" or "Frankie". Frankie does write songs and sings them with the help of his brothers. Frankie's dream is to be in his brothers' band Jonas Brothers.
Although his dream isn't achieved yet, he and some of his friends have made a band named "Hollywood Shake Up".