Sergio was completely out of Amoura Lewinsky's life. In fact, he didn't even tell her where he was going. Sergio disappeared without anyone knowing, including Max, who had worked for him for decades. More precisely, when he was adopted as a child by the cold man's parents as the younger brother of the young master Sergio Aguero.
Max still remembered how his adoptive father had elevated his status by giving him a place of honour in the family. Despite being adopted, Sergio's parents never made a distinction between the two children. It was just that Max knew his place and didn't want to take advantage of their kindness.