Blanca Cap (born March 11, 2030) is one of the adopted daughters of Matthew and Marci Cap. She and her vigintuplet siblings Miguel, Monica, Carlos, Gemma, Rico, Silvia, Jordi, Julia, Aaron, Beth, Javier, Tina, Antonio, Patricia, Raul, Aitana, Rubén, Candela and Sergio were born in Madrid, Spain. When she was 1 1/2 years old, she lost her biological parents, who were killed in a car bombing by a terrorist group called ETA. They were placed in an orphanage until a week after their third birthday, when they were adopted by Matthew and Marci.
- Father: Matthew Cap
- Mother: Marci Cap
- Brothers: Miguel Cap, Carlos Cap, Rico Cap, Jordi Cap, Aaron Cap, Javier Cap, Antonio Cap, Raul Cap, Rubén Cap, Sergio Cap
- Sisters: Monica Cap, Gemma Cap, Silvia Cap, Julia Cap, Beth Cap, Tina Cap, Patricia Cap, Aitana Cap, Candela Cap
- Her full name is Blanca Carolina Cap
- For Halloween 2033, she dressed up as Elsa the Snow Queen from the movie Disney's Frozen