Thank you for this additional information.
Bridget Hennessy is listed as a widow in the 1842 census.
Her daughter Catherine was born January 1839 in Gatineau, Quebec. I can only deduct from this that Martin must have died sometime 1838-1842.
I have a copy of Bridget’s sale of her Land Grant in 1860, it only states, widow of Martin Hennessy, I assume after Marin’s death she must have moved to the Waltham Township, Pontiac County area and purchased this land.
I am trying to determine who the father was of her two children, William born in 1841, and Bridget born in 1845.
Thanks again for taking an interest in my query.