I also have a great uncle who served in WW1 and was killed in action. He is buried in the US Cemetery at Bony, France. Some 30 years ago when I was stationed in West Germany my mother (he was her uncle0 and father came for a visit and we decided to visit his grave. I was stunned to learn he had been awarded the Distinguished Service Cross, no one in the family ever talked about it. When I asked my mother she said, “Oh yeah, I had heard he was awarded some medal.”
The Loyalists were originally from NY State, and more than likely moved to Canada when the war broke out. I often wonder if the young man had fallen in love with the Loyalist daughter while they were still in NY, then gave it all up after the war, to go to Canada and marry the girl of his dreams. Nice story, but no proof. Both families were from Duchess County, NY, so it's definitely a possibility.