John and Jonathan are listed as twins in many databases. David Bunton shows them as born 11 months apart but with the same day and month. The 1850 Census in Madison Co confirms John B.'s age as 43, born in 1807. However, in 1860 in Jackson Co KY, Jonathan's age is given as 41, or a birth year of 1818/1819. In 1870 his age is 51. In 1880 he is 62. All consistent with a birth year of 1818 or so. In the birth order of the children of Elisha & Iffa, he fits very nicely in this place.
The names of the children of Jonathan & Mary Ann came from abstracts of the 1860, 1870, and 1880 Jackson Co KY censuses. I have never found Jonathan in 1850.
Jillson shows the following Kentucky land grants to Jonathan Harrison:
1870 Census. Coyle Precinct, Jackson Co KIY, Hh 1
Jonathan C. HARRISON and Mary Ann LAKES had the following children:
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