| Jonathan Simpson-D'Amico | |
| Gender | 
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| Status | 
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| Hair | Black |
| Age | 7 |
| Relatives | Parents: Michael D'Amico and Lizzy Simpson Siblings: Anthony Simpson-D'Amico and Emelia Simpson-D'Amico Grandparents: Homer Simpson, Marge Simpson, Fat Tony (deceased) and Anna Maria D'Amico (deceased) Aunts/Uncles: Tessa Simpson, Montaigne Prince, Bart Simpson, Gina Vendetti, Lisa Simpson, Milhouse Van Houten, Maggie Simpson and Hudson Taylor Ex Aunt: Jenda Sallington Cousins: Sunny Prince, Sheldon Prince, Picard Simpson, Zia Van Houten, Kirk Simpson, Chase Van Houten, Corvus Simpson, Lydia Simpson, Hattie Simpson, Judith Prince, Vincent Simpson, Cashel Simpson, Maggie Taylor-Simpson, Jr. and John Taylor-Simpson Great-Grandparents: Abe Simpson II, Mona Simpson (Deceased), Clancy Bouvier (Deceased), Jacqueline Bouvier, Zio D'Amico and Unnamed Grandaunts/Uncles: Herbert Powell, Abbey Simpson, Patty Bouvier, Selma Bouvier, Jackson Grunge, Edward Bouvier and Lindsey Naegle First Cousins Once Removed: Alwar Bouvier, Robert Bouvier, Lawrence Bouvier, Gordo Grunge and Sierra Grunge Half First Cousins Once Removed: Thurston Powell, "Bone Cruncher" Simpson, Bella Powell and Felicity Powell Adoptive First Cousin Once Removed: Ling Bouvier First Cousins Once Removed-in-Law: Quincy Lexington, Plum Harris, Nicole Kellis, Mandy Grunge and Jeff Sanford Adoptive First Cousin Once Removed-in-Law: Dawson Larkey Second Cousins: Darrin Bouvier, Sheryl Bouvier, Robert Bouvier Jr., Mark Grunge, Ibriz Bouvier, Fred Sandford and Iris Grunge Adoptive Second Cousins: Ling Bouvier, Jr., Bradon Larkey and Helena Larkey Great grandaunt/Uncle: Fatso Antonio and Angelica D'Amico First Cousin Twice Removed: Fit-Fat Tony First Cousin Twice Removed-in-Law: Angela D'Amico |
| Voiced By | Michael Cera |
Jonathan Vittorio Simpson-D'Amico is the middle child and youngest son of Lizzy Simpson and Michael D'Amico, the younger brother of Anthony Simpson-D'Amico and the older brother of Emelia Simpson-D'Amico.
Biography[]
He is named after Johnny Tightlips, an old mentor of his father and a longtime trusted caporegime of the D'Amico crime family. Much like the person he was named after, Jonathan is the least talkative of his siblings, but he takes after his mother when it comes to his love of science and his father for his interest in cars and cooking.