Joseph de la Garza was the son of Isidro de la Garza and Antonia Cantu.
He requested a dispensation to marry Nicolasa Cantu in 1721. Dispensation source: Guerra et al., Index to the Marriage Investigations of the Diocese of Guadalajara, p.226.
He requested a dispensation to marry Maria Rosa de Villarreal in 1730. Dispensation source: Guerra et al., Index to the Marriage Investigations of the Diocese of Guadalajara, p.90.