It certainly seems like Cornelius b. 1825 was the father of Cornelius b. 1847-48 when looking at the census from 1850 on. In the 1870 census, there is a Cornelius age 22 living with Cornelius b. 1825.
There is a Cornelius Easterwood in 1820 census Erie Co., PA who is of age 26 but under 45. Others in household: Two males of 10 but under 16. A female of age 16 but under 26. Is this Cornelius b. bet. 1776-1794 related to Cornelius b. 1825?
There is also an Emrod Easterwood in the 1820 census of Erie Co., PA, but I do not find him in later census.