My Great Great Grandparents Were Mary Carnahan and Isaiah Chambers of Bailieboro CO Cavan Ireland I Am Trying to Possibly Connect Mary Carnahan to...

Archibald Carnahan, lived in Lisball, Co Cavan, and in mid 1830s, immigrated to Ontario Canada with most of his family, living in Weston, Ontario, and finally settling in Meaford, Ontario. After having DNA done, I find I am connected to many of his relatives...most think that my MARY CARNAHAN was possibly one of his children, who perhaps was already married by then, and who did not immigrate to Canada.
Any help would be appreciated.