On 27 Jan 1838, he purchased land at Middleton Township from his brother David. On 18 Jan 1847, he purchased land at Charlotteville from James Innes Lewis. In 1852, he was single and living with his brother David in Charlotteville.
From 'The Loyalists in Ontario' comes the note:
"Barnum.. Nathaniel Bunnell, settled Charlotteville, his children
1. David Wheeler Barnum, got his O.C.4 Dec 1834
2. Charles D. Barnum O.C. 17 Oct 1839
3. Thomas Arnold Barnum, O.C 28 Jan 1841
4. Lois Green Barnum m. William Kimber, O.C. 3 Oct 1833
5. Henry V Barnum, O.C. 10 Mar 1834
6. James Russell Barnum, O.C. 10 Mar 1834
7. Christina Barnum m. Henry Liger, of Woodhouse, O.C. 7 Feb 1833
8. Andrew Willson Barnum of Bayham, O.C. 22 Dec 1832
9. Samantha M barnum m. James Clark of Walsingham, O.C. 6 Feb 1828
O.C. stands for "Order in Council", which means that they were now either married (if female) or over age 21, and could then claim their free land grant as a child of a Loyalist. In the case of males, it gives you a good idea of when they were born. All those with no location given were in Charlotteville, near their father.