There's a tree on Ancestry with what appears to be the same story. It says, "Duncan Laing was born in 1844, in Scotland. In 1849 when he was five, his parents brought him to Fullerton County, in what as then known as Upper Canada. A few days after arriving, his parents both died, and an aunt, Mrs. Fullerton, took him in and raised him..." More of this available on Ancestry on Armstrong Family Tree by bmilner172 so it looks like the Isle of Man link is wrong.