Yes, I have had some success with these two brothers, who were the Clinton County (NY)-born sons of my g-grandfather Joe (1823-1908), and brothers of my grandfather Gilbert Hamelin (1856-1947).
Alex and Joe went by Hamlin; their two brothers, by Hamelin. Old Joe went by Amlaw. It has complicated the searches.
Alexander Ham(e)lin (1846-1909) married Josephine Boire, resettled in Athol, MA, and in 1903 -- at the age of 57 -- moved with his wife and two of his children to Chico, CA, where he laid brick for the Diamond Match Company. Only two weeks ago, I found his and son Rodley's graves there. I just heard from a woman who may descend from one of his other children. I know what happened to only the two of their six. The hunt goes on.
Joseph Kit Hamlin (1860-????) married Rosanna Vachereau and had five children. I am in touch with one of his g-grandchildren, living in New Hampshire. Rosanna died when Joe Kit was 48, and a couple of years later he disappeared, apparently for the life of a hobo. He turned up twice over the years, asking family members for help as an old man during the depression. A sad end to a good life. I am still hopeful of finding a death certificate someplace.
Did you even nail down Eustache as the 15th child of Rene Hamelin and Marie Therese Marguerite Riel, as was your assumption?
Yes, it's been awhile. I trust you're fit and happy.