His father was Gabriel de la Garza.
In 1701, he requested a dispensation to marry Maria Lozano. It was her second marriage. Dispensation source: Guerra, et. al., Index to the Marriage Investigations of the Diocese of Guadalajara, p.274.
In 1702, he requested a dispensation to marry Luisa Guerra. It was his second marriage. Dispensation source: Guerra, et. al., Index to the Marriage Investigations of the Diocese of Guadalajara, p.276.