When Sergio was 2 years old, they moved to Florencio Varela, in southern Greater Buenos Aires.
Muddo ka badan 18 bilood, shaqaalaha McKnight waxay ka qayb qaateen taxane tababar ah oo la adeegsanayo Waxyaabaha Horumarinta Dhaqammada Dhaqameedka si loo sii xoojiyo awooddeena si ay si firfircoon uga dhexgalaan khilaafaadka.