It's possibly just an error about his mother.
His Canadian Attestation papers list:
Attested at Winnipeg, 18th December 1914
Thomas James Swindell, born Mayfield, Staffordshire, 6th May 1893
Next of kin: Mrs. T. Hudson, (Mother), Mayfield, Staffordshire
Trade/Calling: Farmer
Unmarried
Apparent age: 21 years 7 months
Height: 5 ft 10 ins.
Complexion: Fair
Eyes: Grey
Hair: Light Brown
Religious Denomination: Wesleyan
Anne

P.S. If you'd like copies of the Attestation Papers (2 pages), send me your personal e-mail via PM.