John Stowell Arnold's great-grandchildren

John Stowell Arnold was a Civil War Veteran who served throughout
the conflict. He enlisted from Connecticut, after the war settled
in Stafford Springs, CT working as a carpenter. He and Ellen
Victoria Davenport had several children.
I am searching for any of his ggrandchildren, so far without
success.
I have copies of JSA's Civil War diaries & letters home to his
mother along with photos of him, his grave, CW relics, etc.
I have visited his home; talked with a next door neighbor who
knew JSA - he as young man, JSA as an elder gentleman.
My Arnold maternal side is Heck, several who live in and around
the Union, CT area.