I have been trying to find more information on one of my family lines which is from the Grodno region in present-day Belarus.
A little background information:
My paternal grandfather's line is from Grodno, and that's as much as I can tell you. He was born in Nowosiółki (Navasiolki), and his brother was born in Dorguń (Dorhuń), about 4km from the present-day Polish/Belarusian border.
I have a scanned copy of a shortened copy of his birth certificate, which states his father and mother's names (although I already had that information), and that he was born in Nowosiółki in 1921 (actually 1923, lied to fight in WWII).
Recently, I was given the names of my great-grandfather's parents, thanks to a relative.
I guess my question would be: Where would I start and which government agencies should I be contacting? Polish or Belarusian?
I do not have much past my grandfather, just his parents names and his grandparents names.