Answer
Quintus Servilius Caepio Brutus, originally known as Decimus Junius Brutus Albinus, was adopted by his uncle, Quintus Servilius Caepio, after his father's death. The adoption ceremony involved a symbolic sale and purchase, where the adoptive father purchased the child from his natural father. This act legally severed the child's ties to his birth family and established him as the son of his adoptive father.