Theresa Cockerell married again 1841 Archibald Montgomerie, 13th Earl of Eglinton as his first wife, and bore him three sons (of whom two succeeded successively to the earldom) and one daughter.
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Several early settlers, impressed by the Eglinton Tournament hosted by the 13th Earl, named the hamlet developing at Yonge Street and the wagon trail between the third and fourth concessions after the Earl.
Seton Montolieu Montgomerie (the second son of Archibald Montgomerie, 13th Earl of Eglinton) and his wife, Nina Janet Bronwen Peers Williams, daughter of Lt.