So good to hear from someone researching the same family! I am a descendant of Jane Ahern (sister of Elizabeth). Jane was married “in the presence of Elizabeth Ahern”. I would love to know what you have on the family. Below is what I have so far on William/Catherine (some dates a bit inconclusive as yet as you will note). Still haven’t tracked down William’s mother (hope you have!). I have further info about the descendants of William (concerning daughter, Jane who married Samuel Foley) -- am happy to share if it is of interest.
PS: I tried emailing you on email you gave in your message but it bounced back!
Catherine’s parents were William Smith (born 1778/1781, Monaghan, Ireland; died 2 June 1856, Wollongong (buried at Old Wollongong Catholic Cemetery, Crown St. East, Wollongong (now the Andrew Lysaght Park)and Mary McGuire (born 1776, Monaghan, Ireland; died 27 Oct 1856, Australia ) – married 1802, Aughanamullen, Monaghan, Ireland.
William Smith was a Convict – convicted in 1821 for Life, transported in 4 Nov 1821 on the “Isabella I”, arrived Sydney 9 Mar 1822 -- he was a Weaver at time of transportation; he became a Farmer in NSW (see details attached). William’s parents were Andrew Smith (born 1752 - ….) and Catherine O’Connor (born 1756 - ….). Mary McGuire was the daughter of Constantine McGuire and Bridget Newman. She came to Australia in 1825 with her daughter, Catherine aboard the “Thames” as a Free Settler, after her husband’s transportation.
Children of William Smith and Mary McGuire:
2.i Bridget Smith (1805-1870) – married James McCourt, 1830 (6 children)
2.ii James McGuire Smith (1809-1875) – married Anne Marie Thorne, 1836 (18 children)
2.iii Catherine Smith (1812-1878) – married William Ahern, 1827 (14 children)
2.iv Mary Smith (1814-1856) – married Thomas Maher, 1836 (8 children)
2.v Nancy Smith (1816-1892) – married John Andrews, 1837 (11 children).
William Ahern(e), born 1793/1795?, Mallow, Co. Cork, Ireland; died 1871, Fairy Meadow, Wollongong. Parents: William Ahern and ………?
Married Catherine Smith 1827, Sydney; born ?1807/1809/1812, Monaghan, Ireland; died 12 Dec 1878, Fairy Meadow, Wollongong.
A Convict: a William Ahern (born ?1795/1798, Mallow, Cork) was convicted in Tipperary in 1820 for 7 years and transported from Cork on the “Prince Regent II” (383 tons), arrived Sydney on 9 Jan 1821. The Prince Regent II left Cork 17 Sept 1820 with 181 (144?) convicts -- 3 died on the voyage. Captain, Francis Clifford; Surgeon, Alexander Tayler. (Note: Ned Kelly’s grandfather was transported on the Prince Regent in 1841!).
William’s occupation at time of transportation was ‘Gardener’. He received his Certificate of Freedom (No. 27/1046) on 28 Nov 1827 (the year he married). In the 1828 NSW Census, William and Catherine were living in Bathurst (name transcribed incorrectly as “Ahron”). William Ahern was declared Insolvent -- a Farmer in 1859, Fairy Meadow, Wollongong).
Children of William Ahern and Catherine Smith:
3.i Bridget Ahern, born 1828
3.ii Mary Ahern, born 1830 (4 Records!), died 1929, married James Duggan (daughter Amelia Duggan (1869-1929)
3.iii Ann Ahern, born 1831 (3 Records!)
3.iv Jane Ahern, born 1839
3.v Elizabeth, born 1841
3.vi Ellen Ahern, born 1843
3.vii James, born 1849