I may be a little late here jumping in, but maybe I can help??David Wedgewood and Margaret Moore of Derry West were my great grandparents.
William Wedgewood b.1795 married Mary Smith in England. They emigrated to Canada abt.1842.William died, and Mary remarried Thomas Brown.He helped to raise her 4 children. Ellen, William, John, David. They had a son of their own, Thomas Brown.