He was born circa 1597. His father was Juan Guerra de Reza, and his mother was Ana Maria Magdalena Saldivar Oñate Mendoza.
He married Maria de Sosa, daughter of Alonso de Farias and Ana de Sosa Albornoz.
Vicente de Saldivar. He married Ursula de Urrutia.
Margarita Saldivar de Sosa. She requested a dispensation to marry Diego de Ayala Treviño. They were married on 21 Jan 1652 in .
Mariana Saldivar de Sosa. She married Diego Garcia de Quintanilla, son of Lucas Garcia Rodriguez and Juliana Farias de Quintanilla.
Maria Saldivar de Sosa. She married Bernardo Garcia de Sosa, son of Lucas Garcia Rodriguez and Juliana Farias de Quintanilla.
Maria de Sosa Saldivar. She married Baltazar de Treviño, son of Alonso Treviño de la Garza and Anastacia Gonzalez Hidalgo.
Agustin Saldivar. He married _ Salinas.