Gonna keep getting harder to get accurate info, too. As I recall, there were different bands, sort of like the Gaelic clans. Each with slightly different customs. And they've all been scattered to the four winds. Between Hitler and Stalin, most of the ones in Eastern Europe were wiped out. Just a wild guess, but I'd bet there are more of them in the U.S. than in Europe, at this point.
Maybe this woman can get you a sit down with a grandparent ?