Hi,

I didn't find their death dates in Ancestry nor in FamilySearch. It's odd that I didn't find them in any Census other than the 1900 Census.

You can do a Google search for Rockland County New York Cemeteries and look for them in the inventoried cemeteries.

You can contact the Rockland County Clerk, Records Center Archives, www.orcklandcountyclerk.com/archives.html#collect and order copies of their death certificates. Successful Searching!