This is a small update on Seneca & Rachel of Little Falls. It appears they had at least 11 children: James, John, Cornelia, Jane, Frank, George, Harrison, Edward, Margaret, Irving, Elizabeth.
It is unclear what ever happened to Seneca much after 1880. However, Rachel appears as a resident of Little Falls NJ on the 1910, 1920, and 1930 census'. In 1910 she was 63 and recorded as widowed. In 1930 she was 81 and living with daughter Elizabeth & her husband Orrie.
I would appreciate it if anyone could further confirm this information. Rachel & Seneca's youngest son Irving - was a railroader - and my grandfather.