Need info on visiting Lithuania (Vilnius)

Hello. I am planning a trip to Lithuania with my father and nephew.Can anyone give me info on the following places: Gobernic, Sulvalku, and Kopaciumiestas? I'm not sure about the spelling, but these are towns/villages where my Dad's parents came from. They didn't know each other in Lithuania; they weren't from the same
town/village, and his Mom (my grandmother) was a little girl when she came to
America. I think these places are in the southwest part of Lithuania. If we
can, I'd like to get my Dad to these towns/villages while we are there. One
thing I'm looking into is flying into Warsaw and then taking the train to
Lithuania. If we do that, I think we will be positioned to be close to these
towns/villages. Does this sound correct?