He married Mary Cox . Mary Cox was born at of Fennywood, Lunenberg, Virginia Abt 1728 daughter of John Cox and Mary .
They were the parents of 8
children:
Keziah Smithson
born Abt 1753.
Mary Smithson
born Abt 1755.
Anson Smithson
born Abt 1757.
Basil Coleman Smithson
born Abt 1759.
Marson Cox Smithson
born Abt 1761.
Asa Smithson
born Abt 1763.
Albert Smithson
born Abt 1765.
Bartley Smithson
born 26 Jan 1767.
Micajah Smithson died 4 Jul 1823 .