He came to the US on the Gleaner with his parents and siblings in 1842. 
They were one of the early families at the Scottish Settlement at Argyle in Illinois.
He married Janet Ralston. They had one child, Margaret, born in 1867.
He passed away in 1878.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXQW-395 : 12 April 2016), Alecksander Mckay in household of Robert Coldwell, Cincinnati, ward 3, Hamilton, Ohio, United States; citing family 3, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
(Coldwell=Colville) His sister Agnes and brother in law.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6W1-BFL : 12 April 2016), Alexander Mckay, Illinois, United States; citing p. 11, family 83, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,793.
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Alexander is 20 degrees from Elizabeth Winter, 22 degrees from Antoine de La Mothe Cadillac and 21 degrees from Victoria of the United Kingdom of Great Britain and Ireland on our single family tree. Login to find your connection.