Bezos was born Jeffrey Preston Jorgensen in Albuquerque, New Mexico, on January 12, 1964, the son of Jacklyn (née Gise) and Ted Jorgensen. At the time of his birth, his mother was a 17-year-old high school student and his father was a bike shop owner. After his parents divorced, his mother married Cuban immigrant Miguel "Mike" Bezos in April 1968. Shortly after the wedding, Mike adopted four-year-old Jorgensen, whose surname was then changed to Bezos. The family moved to Houston, Texas, where Mike worked as an engineer for Exxon after he received a degree from the University of New Mexico. Bezos attended River Oaks Elementary School in Houston from fourth to sixth grade. Bezos' maternal grandfather was Lawrence Preston Gise, a regional director of the U. S. Atomic Energy Commission (AEC) in Albuquerque. Gise retired early to his family's ranch near Cotulla, Texas, where Bezos would spend many summers in his youth. Bezos would later purchase this ranch and expand it from 25,000 acres (10,117 ha) to 300,000 acres (121,406 ha). His maternal grandmother was Mattie Louise Gise (née Strait), through whom he is a cousin of country singer George Strait.