Details of Thomas's birth are not known.

Thomas married Sarah Parkes in 1906 in Dudley, Worcestershire.

He had the following children from his marriage to Sarah Parkes:

- Lily Sidaway	born around 1907 at Netherton, Worcestershire.
- Minnie Sidaway	born around 1909 at Netherton, Worcestershire.
- James Sidaway	born around 1911 at Netherton, Worcestershire.

Details of Thomas's occupation are not known.