'Christopher Lightner, son of William Lightner ... married Catherine Zickafoose and migrated to Kentucky.' He had a son named William Lightner.
If this William Lightner was the one in the 1820 and 1830 censuses in Kentucky and the 1840 census in Missouri, and if his age is correct in those censuses, he was born no later than 1790, and had children born as early as 1815.