Wikisimpsons - The Simpsons Wiki
He appears almost exactly and speaks quite like his father, but with a slight European accent. His hair looks similar to Sideshow Bob's hair (resembling a palm tree). He looks like a toddler version of his father, but his feet are smaller. He also shares his father's hatred towards Bart Simpson.
Gino was born in the Italian village of Salsiccia to Bob Terwilliger (a.k.a. Sideshow Bob, who sought a new life as mayor of the village) and Francesca Terwilliger. When Sideshow Bob's life was ruined, he followed Sideshow Bob and Francesca as they tracked the Simpsons down in Rome. He, along with his mother, helped Bob to try to kill the Simpsons. After Krusty saves the Simpsons family, he chases a butterfly.
After failing to kill the Simpsons, he and his family fled to England where Bob got a job as a chimney brusher. He and his family tour around England going to Buckingham Palace, Sherlock's museum, and rowing a boat (Gino is seen using a megaphone telling his parents to row). Eventually, Bob, Francesca, and Gino sneak back to the US on a train. Gino and the rest of his family constructed a trap to kill the Simpsons by building a phony barbeque restaurant and constructing a commercial about it. All of this was told by Sideshow Bob.
After Sideshow Bob's relatives hatch an ultimate plan to kill Bart Simpson but fails, he and his family were caught and thrown into prison.