Found on Ancestry - OneWorldTree - (obviously would need verification)

MARIA JOHNSTON b. 1831 Yorkshire, Hatfield Parish, England
m. JAMES HALLADAY b. Apr 6, 1831, S. Crosby, Leeds, Ontario

Maria's father listed as JOHN JOHNSTON b. 1805 Ireland, d. 1871, m. ELIZABETH BALL b. 1806, d. 1900
Children: William b. 1836
Isaac b. Apr 2, 1837
Jane b. 1839
James b. June 2, 1841
Alexander b. July 31, 1846
John b. Mar 31, 1847
Robert b. Feb 16, 1848
David b. Apr 3, 1850
Sarah Ann b. Mar 4, 1853
Thomas Albert b. 1856
Eliza b. 1859

No ancestors shown for Elizabeth Ball/Bell

JOHN JOHNSTON's parents shown as WILLIAM JOHNSTON b. 1761 Ayreshire, Scotland, d. Jan 22, 1864 and MARGARET FERGUSON b. Oct 1771 Sligo Parish (listed as in Scotland, but is in Ireland), d. 1835. Their first child, Robert is shown as b. Nov 11, 1791, Ballykillybegs Parish, Donegal, Ireland. The younger children (9) b. between 1800 and 1815 in Ireland.

WILLIAM JOHNSTON's parents shown as ROBERT JOHNSTON b. Abt. 1735, Loch Doone, Ayreshire, Scotland d. Abt. 1800 Ireland and ELIZABETH ? d. Abt. 1800 Ireland.
MARGARET FERGUSONS's parents shown as ROBERT FERGUSON and SARAH ?.

At the very least, this may be a good starting point for us.

Kathleen