John Blair was born 11 April 1705 in Downpatrick, Northern Ireland, United Kingdom and died 4 September 1776 Newberry, South Carolina, United States of unspecified causes.
Children
| Name | Birth | Death | Joined with |
| James Blair (1740-1812) | 20 February 1740 Downpatrick, Northern Ireland, United Kingdom | 12 August 1812 Newberry, South Carolina, United States | Margaret Jane Jenkins (1755-1796) |
Siblings