I put far more stock in my family's genealogical records and my relatives still in the old world (Deutschland, Czechia and France) but it always amuses me, no end, how ancestry.com results constantly change so dramatically! Still interesting nonetheless.
As a 4th generation American I'm lucky in that we still have some traditions from the old world connecting us to the cultures but still , being American and further removed than we should like from old traditions a lot of Americans feel that lack of deep rooted culture because of our "meltingpot" philosophy and as such we desperately cling to our European heritage and most just want to learn more about said heritage and how to pay homage to that.
A lot of Europeans currently living in Europe don't understand this fascination a lot of Americans have and often ridicule Americans when they bring it up, but please see that this is, in a lot of cases, a plea to know more about their native culture to perhaps bring it back home and practice it there.
I don't expect you to do anything yourselves unless perhaps they are your friend but perhaps the next time an American says to you "I'm __% whatever" ask "That's neat, would you like to learn more about the culture? " and give them the name of a heritage museum or something, then it's in their hands to learn something if they are serious.
Like I say I'm lucky enough to have family and have visited the lands of my people so I can just message them whenever I feel like learning more than what we currently do but most are not so fortunate.
Bah, just my thoughts, take them or leave them.
Hail the gods and goddesses
Hail the land wights
Hail the ancestors