John married Mary McQuiston in 1809 in Pennsylvania. Mary (daughter of Andrew McQuiston and Elizabeth McClurkin) was born about 1789 in County Antrim, Ireland; died on 21 Sep 1853 in North Shenango Township, Pennsylvania. [Group Sheet] [Family Chart]

1. Elizabeth Blair was born on 27 Dec 1809; died on 30 May 1879.
2. Hugh Blair was born in 1812; and died.
3. Margaret Blair was born in 1814; and died.
4. Jane Blair was born in 1820; and died.
5. William Blair was born in 1825; and died.
6. Robert Blair was born in 1828; and died.
7. Andrew Blair was born in 1832; died on 8 Jul 1844.