Imagine that! By 1776 he was 16 years old. By 1790 he was 30.
Was his father granted US citizenship or was it denied him due to his loyalties? What did happen to "dear old Dad"?
Was the son denied US citizenship?
Oh, that's right...you're trying to equate State citizenship with US citizenship when the rules were still being ironed out. Never mind.
Dad was imprisoned and then exiled to England, where he lived out his life. His son was always considered a citizen.
As a citizen of a state he became a citizen of the United States with the adoption of the Constitution.