He was born circa 1573. His father was Miguel de las Casas.
He married Maria Beatriz Navarro, daughter of Juan Navarro and Maria Rodriguez de Sosa. It was her second marriage.
Juliana de las Casas. She married Diego Fernandez de Montemayor, son of Diego de Montemayor and Elvira de Renteria.
Marcos de las Casas. He married Gertrudis de la Vega.
Bernabe de las Casas. He married Isabel de la Garza, daughter of Capt. Blas Maria de la Garza Falcon Treviño and Beatriz Gonzalez Hidalgo Navarro.
Joseph de las Casas Lobo Guerrero. He married Ana Guerra Cañamar, daughter of Vicente Guerra Cañamar and Leonor de Morales.
Maria de las Casas, born 1604. She married Juan Alonso Lobo Guerrero, son of Juan Lobo Guerrero and Juana Fernandez de Cordova.
Beatriz de las Casas, born 1604. She married Diego de Villarreal, son of Francisco de Villarreal.