Justin Cap (born May 11th, 2031) is one of the Canadian vigintuplet siblings adopted by Marci and Matthew Cap. Justin and his vigintuplet siblings were born in Toronto, Ontario in Canada. At the age of 14 months, he and his vigintuplet siblings, Martin, Avril, Celine, Gordy, Adolph, Kadim, Alannah, Demarco, Emma-Lee, Drayden, Ebony, Elijah, Jo-Beth, Johnpaul, Jody, Gavin, Julessa, Karessa and Hank were put in a foster care and later adopted.
- Father: Matthew Cap
- Mother: Marci Cap
- Brothers: Martin Cap, Gordy Cap, Adolph Cap, Kadim Cap, Demarco Cap, Drayden Cap, Elijah Cap, Johnpaul Cap, Gavin Cap, Hank Cap
- Sisters: Avril Cap, Celine Cap, Alannah Cap, Emma-Lee Cap, Ebony Cap, Jo-Beth Cap, Jody Cap, Julessa Cap, Karessa Cap
- His full name is Justin Woody Cap
- For Halloween 2033, he was dressed up as a vampire
- He and the rest of his vigintuplet siblings are fans of Rolie Polie Olie
- His favorite animal is the beaver
- He is allergic to cats and pollen.
- His favorite candy is Sour Patch Kids.