Daughter of John Ostler Sr. and Sarah Endacott Gollop. Evidence from emigration and church ordinance records proves the Ostler family traveled to Utah in 1861. They sailed to America in 1861 on the ship Manchester, arriving in New York City 14 May 1861. A church ordinance was performed for John and Sarah in Salt Lake City 29 November 1861. In Utah Mary married Charles Richard Brewer Ockey.