Stephen Percival (b.29 Mar 1752) was a Green Mountain Boy enlisting in 1774 and serving 28 months. Pension papers S18539. Married Content Morse and I know only that they did have a son Stephen. In Lorraine Martin's booklet she says the relatives of Stephen Percival from the Oklahoma area meet for reunions and that they are descended from Stephen's son Stephen so maybe they will read your note and be able to give you more info. Good luck!!