ages and marriage seem way out as the first two children are born in 1750s

Question

The ages seem way out 2 children born c 1750 and c 1753 and 2 after 1770, ?

Comments

Also pretty unlikely that a ten year old child (who lived in Georgia and  didn’t marry until 1770, twenty years later) was having children in Pennsylvania in 1750.  Looks like a muddle of more than one family - or at least more than one wife.

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"Son" Hugh is from a different family and should be detached.  He was a Revolutionary War patriot DAR #A064698. Looks like his father may have been another Hugh Kennedy/Canady born in Ireland in 1725.  DAR # A064699.  They both lived in Cumberland County, PA during the Revolutionary War.  The elder Hugh left a will naming a son Hugh, more research needed to see if he is the same man. 

 https://www.familysearch.org/ark:/61903/3:1:3QSQ-G991-8S3V?from=lynx1UIV8&treeref=L5JP-CQD&i=68

1750 Hugh moved to Ohio and died there.  "United States Census, 1820," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHL3-7TW : accessed 6 November 2020), Hugh Canada, Clark, Brown, Ohio, United States; citing p. 395, NARA microfilm publication M33, (Washington D.C.: National Archives and Records Administration, n.d.), roll 86; FHL microfilm 181,392.