Trying to track down my roots for my grandfather and great grandparents.

Abraham Sandler (born 1889) and his parents Kushiel or Cushiel Sandler (and his wife Musha). My grandfather's internal passport and call up papers from 1909 show that he was living in Dolginovskaya (Dolginovo? or the current Dauhinava in Belarus). At the time the region was administered from Vilnius. The paper also refers to a 1905 family list. Abraham was the youngest of five children - Nathan (b.1873), Hinda (b.1875), Itca (Rebecca) (b. 1880) and Soloman (b. 1885). If anyone has information or advice about how to track down more information and, in particular, whether the reference to the 1905 family list is helpful that would be great. Thx.