Juan Carlos I sibling Infanta Margarita, Duchess of Soria
He has two sisters: Infanta Pilar, Duchess of Badajoz (1936–2020); and Infanta Margarita, Duchess of Soria (born 1939). He also had a younger brother, Alfonso.
The rendering of his name as "Juan Carlos" (the first and second particles of his baptismal name) was a modification by choice of Francisco Franco. He was always known in his familiar circle simply as "Juan" or "Juanito".
brother or sister kin