What a lovely folk song, Sean. And an unusually warm tribute to a father. It's great that you posted it for us to hear.
You used a total of 3 Mandolins from World I think? The lead - then on the chorus, a 2nd one comes in on the right, and a 3rd one just left of center is double picking the melody. That gives a nice full sound.
There are two chord choices which I'd like to hear differently. After the appropriate, folk simplicity of the song, ending on the major 7th chord sounds out of place. M7ths are beautiful on their own, but when out of context they can stick out, and I feel that with your song, it suddenly shifts the mood to something too modern sounding.
The other chord choice is that you don't go to a straight 7th on the transitions between sections. The traditional element of shifting to a 7th on transitions is appropriate for folk music, and while of course you don't Have to use it, I felt it could have been used here effectively.
Hope you don't mind those observations. I don't usually suggest alternate chords - but it's not very often that we have actual songs posted here, and it piqued my interest.