William Maurice Rees was born on Thursday 4 July 1889.

William married Constance Annie MacDuff Adams in 1915 in Wednesbury,Staffordshire.

He had the following children from his marriage to Constance Annie MacDuff Adams:

- Daniel S. Rees	born in 1915 in Wednesbury, Staffordshire.
- Gwendoline MacDuff Rees	born in 1922 in Wednesbury, Staffordshire.
- William Charles Rees	born on 7 March 1924.
- William Charles Rees	born in 1924 (date suppressed) at West Bromwich, Staffordshire.
- Wilfred Rees	born in 1932 at West Bromwich, Staffordshire.
- John Maurice Rees	born in 1952 (date suppressed).

Details of William's occupation are not known.

Details of William's death are not known.