Shirley-Marie: Going through older posts and came across this one. By now you might have been able to find more information but if you haven't done so the following might be of interest.
According to notes I was given:
Samuel Caldwell (b.c1812) m. Nancy Gibson (c1808-1869), daughter of Thomas Gibson, and had at least 9 children.
1. Margaret (b.c1834).
2. Samuel (b.c1834) m.(1859) Margaret Irving and had family.
3. William John (b.c1835).
4. Jane (b.c1838).
5. Nancy (b.c1840).
6. Eliza (b.c1843).
7. James (c1847).
8. Rebecca (c1849).
9. Emily (b.c1851).
Samuel (b.c1812) had a sister Margaret and brother John (d.1859 m. Jane). I don't know the names of their parents. The family is believed to have been from Aghadowey Parish.
1857 "Elizabeth" to St. John, Canada (all from Coleraine): Samuel Caldwell (45), Eliza (14), James (10).
1858 "Mary Ann" to St. John, Canada (all from Coleraine): Nancy Caldwell (50), Jane (20), Nancy (18), Rebecca (11), Emily (7).
I'm not related to this family and have no further details.