John married Gwenllian Davies on 13 May 1825 in Merthyr Tydfil, Glamorgan, Wales. Gwenllian was born about 1806 in Merthyr Tydfil, Glamorgan, Wales; died on 17 Sep 1882 in Canton, Cardiff, Glamorgan, Wales; was buried on 21 Sep 1882 in Llandaff, Glamorgan, Wales. [Group Sheet]

1. Mary Lewis was born on 22 Oct 1826 in Merthyr Tydfil, Glamorgan, Wales; was christened on 15 Nov 1836 in Twyn-Yr-Odyn Presbyterian, Merthyr Tydfil, Glamorgan, Wales; died after 1901.
2. Ann Lewis was born on 24 Dec 1828 in Merthyr Tydfil, Glamorgan, Wales; was christened on 15 Nov 1836 in Twyn-Yr-Odyn Presbyterian, Merthyr Tydfil, Glamorgan, Wales; died after 1841.
3. David Lewis was born on 18 Feb 1831 in Merthyr Tydfil, Glamorgan, Wales; was christened on 15 Nov 1836 in Twyn-Yr-Odyn Presbyterian, Merthyr Tydfil, Glamorgan, Wales; died after 1861.
4. John Lewis was born on 18 Jan 1833 in Merthyr Tydfil, Glamorgan, Wales; was christened on 15 Nov 1836 in Twyn-Yr-Odyn Presbyterian, Merthyr Tydfil, Glamorgan, Wales; died after 1883.
5. Jane Lewis was born on 1 Jul 1835 in Merthyr Tydfil, Glamorgan, Wales; was christened on 15 Nov 1836 in Twyn-Yr-Odyn Presbyterian, Merthyr Tydfil, Glamorgan, Wales; died on 14 Oct 1912 in Cardiff, Glamorgan, Wales.
6. Margaret Lewis was born about 1837 in Merthyr Tydfil, Glamorgan, Wales; died after 1851.