Now Dolhinow = Dolginowo, little town (or big village) in Wilejski rajon (region), Minsk oblast (county), Belaras
you can coordinates Dolginowo, 145 km from Vilno to the East: 54.650000,27.483333 (Google)
In 1920-1939 - center of gmina RP2, miastechko (little town), in 1938 - 3200 people, most of them - Jews.
Dolhinow (polska) known since mid-15th
century as a major trading center, ownership of Vilno governor.
Unfortunately, your family came to the so-called 3rd or 4th wave of deportations, on which there is little data on the Internet. But it is necessary to look. Try to find out where in the "Siberia" They spent six months or a year.
My relatives are from the same area, but only to south-west 100 km from D. When looking for information about relatives in different Belarus archives, I found only in the Zonal data archive in Molodechno, where you should go.
Stan from M.