The next step would be to see if George (b.1805) might be buried around Lucas County, OH.He doesn't seem to be buried in Ontario County, NY, but that would make sense if the family had moved from there.
One of the sons under 5 could be John Robert Fewlass (b.1834) and the daughter, Hannah (Fewlass?) (Smith?) b. abt. 1838.Not sure who the other son would be.