Sidney married Irene Anne Grogan between 1 Apr 1906 and 30 Jun 1906 in Cardiff District, Glamorgan, Wales. Irene (daughter of Edward Grogan and Jane Noel) was born on 6 Feb 1881 in Norfolk Villa, Stacey Rd., Roath, Cardiff, Glamorgan, Wales; died between 1 Apr 1919 and 30 Jun 1919 in Cardiff District, Glamorgan, Wales. [Group Sheet]

1. Eileen Audrey Lewis was born on 2 Apr 1907 in 1, Richard's Terr., Roath, Cardiff, Glamorgan, Wales; died after 1951.
2. Oswald Noel Lewis was born between 1 Apr 1908 and 30 Jun 1908 in Cardiff, Glamorgan, Wales; died on 28 Oct 1933 in Torbay Hospital, Torquay, Devonshire, England.
3. Marjorie Frances Lewis was born about 1910 in Cardiff, Glamorgan, Wales; died after 1939.
4. Clarice Mary Lewis was born on 29 May 1912 in Cardiff, Glamorgan, Wales; died after 1939.

Sidney married Frances Maud Knibbs between 1 Apr 1924 and 30 Jun 1924 in Neath District, Glamorgan, Wales. Frances (daughter of John Knibbs and Ada Davies) was born on 28 Dec 1896 in Linslade, Buckinghamshire, England; was christened on 10 Feb 1897 in Linslade, Buckinghamshire, England; died between 1 Jul 1975 and 30 Sep 1975 in South Glamorgan District, Glamorgan, Wales. [Group Sheet]

1. Valerie Margaret Lewis was born on 21 Apr 1928 in Cardiff, Glamorgan, Wales; died after 1952.