João is married to Alden Brewster, an American partner of Banco Icatu. She is the mother of actress Jordana Brewster, with whom she starred in an advertising campaign in the United States in 2015, and lives in New York City with her family.
London, March 2 1978: "Alden Brewster, son of the United States Ambassador to Britain, married Maria Joao de Sousa here yesterday in a civil ceremony. Her parents, Mr. and Mrs. Fernando de Sousa, live in Rio de Janeiro. The bridegroom's parents—Kingman Brewster, who is the former president of Yale University, and Mrs. Brewster —attended the ceremony at the South Kensington Registrar's Office. The bride's grandfather, Brazilian Ambassador Roberto de Oliveira Campos and his wife were also present. The bridegroom lives in London and works for First Chicago Ltd., a branch of the First National Bank of Chicago. The bride is one of Brazil's top models. Her picture is on the cover of last month's Sports Illustrated magazine.