My tree ends there. I am trying to go further back
I know of those two sons on John and Martha. I don't know when Garrett dies. I suspect he died in Portage, Columbia, Wisconsin, but can't find a record of him. I know he divorced/separated from his wife, Esther Callahan Cotter. They are my great grandparents.
The little I know about John Cotter came from his obituary in the Beaver Dam Argus newspaper. He and Martha Sloan Cotter are buried in St. Columbkille, outside Danville Wisconsin.
I would appreciate any information you have. Thanks