The document you are looking for is called "McKechnie Family Genealogical Chart" by Charles W. Ferguson published in 1974. LDS call number 929.273 A1 no. 541; location JSMB FAMHIST Book - on microfilm. You will find a number of Neil McKechnie names but I do not believe you will find a Neil and Sarah in Grey County. The above "charts" commences with Neil McKechnie (1750)married to Martha Smith in Islay and takes the family to Ontario circ 1831-33. One of the five family members Donald settled in Priceville, Artemesia Township Grey County.