The brother was Donald MacKay.
Donald settled in Toronto and had a family of two girls and one boy, Kate, Nellie, Sandy.
He had brothers, William (1832 - d.1924) & John (1835 - d. 1916), who settled in Portage La Prairie and another brother, Philip, who we believe died in Oregon, U.S.A.
If you think you connect I am interested in finding out more about this family and their descendants. You can also contact me directly by e-mail at firstname.lastname@example.org
Thanks for touching base. Regards, Richard