Alexander and Mary Wilson had several children:
Catherine b. 1825 Derrylee, married William Weatherhead of Benburb, died 1862 in Benburb
(William is in Griffiths in 1864, and then goes missing; I've never found a death certificate or had him pop up in Ontario or elsewhere -- one of their daughters went to Australia but I haven't found him there either)
Sarah Ann b. 1826, married William Crawford, died before 1892 likely in Rochester, New York
John b. 1827, married Eliza Frazer, died 1912 in Ontario
Margaret (or Mary), b. about 1830, married Alexander Beatty in 1854 in Tartaraghan (no further info)
Robert b. 1835 d. 1853 in Derrylee (buried in Killyman)
Alexander b. 1838 d. 1881 in Derrylee (never married -- informant was nephew Robert Weatherhead)
Thomas b. 1840 d. 1928 in Ontario (hubby's great-grandfather) -- married in Ontario
Elijah b. 1843, d. 1915 in Derrylee married Sarah Larke (he was Royal Irish Constabulary)
I believe Alexander had a brother Joseph who was married to Rachel Matchett. I have all that info as well if you are interested.
Unrelated to this research, but another great-grandfather to my husband was a Wesleyan Methodist minister out of Cornwall who settled and ministered in Newfoundland.