I was given the following information a few years ago and did not follow up on it as I wasn't sure if Francis Johnston was connected to my Robert "Red Robin" Johnston; however, some interesting questions have arisen lately.
"C. Johnston: b. June 12, 1826; baptised February 4, 1827; Lot 21, Conc. 9, Plantagenet."
At that time George Johnson [sic] owned the farm designated in the records. In 1832 his farm was bought by Francis Johnston whose wife was Frances. They had lived on the farm though for a previously undetermined number of years, so "C" may have been their child.
Any and all information that you may have on "C" Johnston will be appreciated.