I understand you are looking for information on Andrew Mann Lyon from the Ottawa area.
There was an Andrew Mann Lyon born to Robinson Lyon
B 1839 D 1890
Married Jane Mann but I don't know when just yet.
She was born in about 1841 in Scotland.
They had, I believe, 6 children together - Andrew Mann, William Thomas, Robert Young - my Grandfather, Norman Herbert, Mary Clarissa Louisa and maybe Robinson Jr. I'm not positive about the Robinson Jr.
This Andrew Mann Lyon was born in about 1862. He married Louisa Mary Dooley who was 16, from Bruce Ohio on 3 March 1887.
I have not yet found documentation of her death or a second marriage for Andrew Mann Lyon, however, if you think this may be the right Lyon, I can give you more information regarding Andrew's Parents, Grandparents, etc.
Hope this helps.
Judith Lyon Grant