Manuel Dominguez' granduncle, the brother of his grandfather Cristobal Dominguez (Domínguez-677) was Juan Jose Dominguez (c.1736-1809). The father of Juan Jose was Jose Ignacio Dominguez. Juan Jose was the original holder of the vast Spanish land concession known as the Rancho San Pedro. Juan Jose never married and died in 1809 leaving his nephew Cristobal, Manuel’s father, heir. Upon the death of Cristobal in 1825, Manuel and his surviving siblings inherited the rancho. The siblings of Manuel Dominguez were Maria Jesus (1796-1799), Josef de Los Dolores (1798-1819), Maria Victoria (1800-1873), Francisca Marcelina (1805-1828), Maria Elena Ramona (1807-1842), Jose Nasario (1809-1860), Pedro Juan Santiago Pectinarzo “Agapito” (1812-1859) and Maria Sinforosa (1815-1820).