• An entry for Reuben Perkes states that Mary Ann Botright (Mary Burthwryte) traveled to Utah in 1868 with the Simpson Molen company. Mary Ann married William's father Jonathan Flatt. Family Tradition and Passenger lists state and indicate that William's father, step-mother, sister, and step-siblings traveled together.

Simpson M. Molen Company (1868)

• Age at Departure: 17

Sources

• Frank Esshom, Pioneers and Prominent Men of Utah (Salt Lake City: Utah Pioneers Book Publishing Company, 1913), 1096. 
• New York Passenger Lists, 1820-1957.