Iwan and Anastasia did not have any more children? How do you know she, Anastasia died in 1930, before or after 1930 census was taken? Were you able to find her death certificate, obituary and these did not bring any more information about her? You might want to go thru Wilno's church records looking for Iwan's and Anastasia's marriage record. Not sure how that works as I am not of Lithuanian ancestry.