Another name for Andrew was Andrew Aitchison.
From The Early History of Elora, Ontario and Vicinity, p. 43:
Noted events in his life were:
• Emigrated: to Canada, 1852, Niagara <(Niagara-on-the-Lake>, Canada West (Ontario), Canada.
Andrew married Elizabeth Ann Bathgate about 1851 in Lauder, Berwickshire, Scotland. (Elizabeth Ann Bathgate was born in May 1830 in Lauder, Scottish Borders (Berwickshire), Scotland, died on 9 Jan 1908 in Pilkington, Wellington, Ontario, Canada and was buried in Elora Cemetery, Elora, Centre Wellington, Wellington, Ontario, Canada.)
1 Connon, John Robert, The Early History of Elora, Ontario and vicinity (1930; 1975 (reissued by Gerald Noonan)).
www.findagrave.com, Find A Grave Memorial# 125169448.