In 1850, the McDonald family traveled to the Salt Lake Valley with the Warren Foote Company. The McDonald family included John Kilpatrick and his wife Rachel Burke Taaffe, and their children William Taaffe, John Taaffee, and James. John was the Captain of the 5th Ten.
Initially, John traveled without his family to the Salt Lake Valley in the Ezra T. Benson Company in 1849. He then returned east to his family, and traveled with them in 1850.
William's middle name is spelled "Taft" or "Taffee".