Individual Details

Betsey Kellar, daughter of Wm Kellar married Abraham Kellar. William Kellar gave his consent. Certificate issued Aug 1808, returned 13 Aug 1808 by Rev. William Kellar who performed the ceremony. The only Abraham Kellar available would seem to be Isaac's son Abraham. He married Leah Abraham Spears but he certainly could have had an earlier marriage to this Betsey.
Joseph also had a son Abraham and I've not found a marriage for him, but he would have been barely marriageable age.

Birth	21 Nov 1791	Tennessee
Marriage	13 Aug 1808	Jefferson County, Kentucky - Abraham KELLAR
Death	11 Sep 1834

Spouse	Abraham KELLAR (1782 - 1849)
Child	Eliza Ann KELLAR ( - )
Child	William Harrison KELLAR (1813 - 1834)
Child	Nancy A. KELLAR (1815 - 1840)
Child	Augustus Moses KELLAR (1819 - 1858)
Child	George Walker KELLAR (1825 - 1855)
Child	Pauline S. KELLAR (1834 - 1840)

Father	Rev. William KELLAR (1768 - 1817)
Mother	Rebeckah Netherton (1773 - 1863)
Sibling	Abraham H. KELLAR (1788 - 1855)
Sibling	Nancy KELLAR (1796 - )
Sibling	Catherine KELLAR (1797 - )
Sibling	Sarah KELLAR (1800 - )
Sibling	Rebecca KELLAR (1801 - )
Sibling	Rachel KELLAR (1803 - )
Sibling	John KELLAR (1806 - )
Sibling	Paulina KELLAR (1807 - )
Sibling	Diana KELLAR (1808 - )