Alexander married Jane Lewis on 14 Jul 1864 in St. John's, Canton, Cardiff, Glamorgan, Wales. Jane (daughter of John Lewis and Gwenllian Davies) 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. [Group Sheet]

1. John Finlayson was born about 1865 in Cardiff, Glamorgan, Wales; was christened on 1 Apr 1865 in St. John the Evangelist, Cardiff, Glamorgan, Wales; died in Apr 1865 in Cardiff District, Glamorgan, Wales; was buried on 3 Apr 1865 in Sts. Peter & Paul, LLandaff, Cardiff, Glamorgan, Wales.
2. Hannah Gwenllian Finlayson was born on 1 Apr 1866 in 2, East Terr., Canton, Cardiff, Glamorgan, Wales; was christened on 6 May 1866 in St. John the Evangelist, Cardiff, Glamorgan, Wales; died between 1 Apr 1905 and 30 Jun 1905 in Lewes District, Sussex, England.
3. Annie Mary Finlayson was born on 23 Dec 1867 in Canton, Cardiff, Glamorgan, Wales; was christened on 9 Feb 1868 in St. John the Evangelist, Cardiff, Glamorgan, Wales; died on 28 May 1929 in 10, Wellfield Road, Roath, Cardiff, Glamorgan, Wales; was buried on 1 Jun 1929 in Cardiff, Glamorgan, Wales.
4. Margaret Maude Finlayson was born about 1869 in Cardiff, Glamorgan, Wales; was christened on 3 Oct 1869 in St. John the Evangelist, Cardiff, Glamorgan, Wales; died after 1901.
5. Donald Kenneth Finlayson was born on 1 Sep 1871 in Alexandra Hotel, Weston Super Mare, Sonerset, England; was christened on 24 Sep 1871 in St. John's, Weston Super Mare, Somerset, England; died on 24 Mar 1958 in Cardiff, Glamorgan, Wales; was buried on 27 Mar 1958 in Western Cemetery, Cardiff, Glamorgan, Wales.