Further feedback has indicated that Antrim may be incorrect but nothing definitive.
I have found David's death record. He passed 24 DEC 1883 in Chatham, Kent, Ontario and age was given as 84 years so birth possibly 1799-1800. Birth location only reported as Ireland and no parents listed. He appears to have been with his daughter, Mary Ann McAdams and her second husband, Peter Woods as Peter is the informant on the death record. They were living in Chatham, Ontario. Cemetery searches have found no burial
Still no sign of Hannah after the 1871 Canada Census