Hi John. The John Dentler born c1777 was a son of Jacob Dentler and presumably Barbara Funk. One of his sisters was supposedly the daughter of Barbara Funk, but Barbara is not the proven mother of all the kids. Jacob later married Elizabeth Koch but this was way after all his children's births. The info on Barbara Funk was from an IGI submission, not an extracted marriage or birth record.
Anyway, John married a Mary and they lived in East Buffalo no later than 1807, Turbot no later than 1820, and Lewisburg no later than 1830. Not in Sunbury as far as I know. John died 18 Aug 1853 in Lewisburg. He & Mary were the parents of my direct ancestor, Catherine Dentler (1808-1894) who married Thomas Mackey.
I can email you a family group sheet on Jacob and Barbara's kids etc. if you'd like.