I am looking for information on a John Nelson(?) Eastman born about 1828 in Ontario (according to the 1881 census). He married a Sarah Chisholm who was born about 1828 in Ireland (according to the 1881 census). In 1881 they were living in Russell, Russell County, Ontario, Canada. I'm trying to figure out who John Nelson Eastman's parents were.

John Nelson Eastman & Sarah Chisholm had (at least) the following children:
1. Jane Eastman: born 1853 in Russell, ON; married John Flanigan Buckingham in 1877 in Vars, ON; died 1930 in Vars, ON.
2. Rachel Eastman: born 1857 in Russell, ON
3. William Eastman: born 1859 in Russell, On; married Susanna Jane Birch in 1890 in Cumberland, ON; died 1922 in Russell, ON.
4. James Eastman: born 1864 in Russell, ON; married Eliza (unknown).
5. David Benjamin Eastman: born 1865 in Russell, ON; married Mary "Minnie" Laughlin in 1894 in Fitzroy, ON
6. Nelson Eastman: born 1865 in Russell, ON; married Charlotte Carson in 1894 in Osgoode, ON
7. Cyrus David Eastman: born 1868 in Russell, ON; married Margaret Jane Early in 1892 in Carleton County, On; died in 1954 in Fitzroy, ON; at one time lived in Kinburn, ON.
8. Henrietta Eastman: born 1874 in Russell, ON.