Re: Russian records #russia
A Google search reveals some sites with information about records for Nizhnyi Novgorod.
FamilySearch has images of revision lists up to 1858, so they may have records of your great-grandparents, but these are unindexed records (images only).
Here is an article about the 1897 census in Nizhny Novgorod: https://vk.com/wall-56122476_3395?lang=en
Here is an article about the central archive for that region:
Here is a listing of archive fonds that may have 1897 census records for that region (in Russian, but use Google Chrome to translate it):
SHUKHAT (Talnoe, Simferopol, Sevastopol, Odessa, Balta (Abazovka), Pogrebishche)
VINOKUR (Talnoe), KURIS (Mogilev-Podolskiy, Ataki, Berdichev)
ZILBERMAN (Soroki, Kremenets), BIRNBAUM (Kamenets-Podolskiy)