No doubt you have seen the find a grave entry: http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=11...
I have a note that Hamilton Douglas was also known as William, and that he might be the son of:
Robert DOUGLASS
b. 1779 Scotland /Ireland
m. by 1817
d. 26 Aug 1863; 84 yrs.
bd. Mystic Cemetery, Quebec
and
Jane/Nancy HUNTER
b. 1789/1786 England/Scotland/Ireland
d. 29 April 1861; 72 yrs.
bd. Mystic Cemetery, Quebec

However, I have my doubts that this is correct.