She, born in Oklahoma, has always said it was "family stories passed down through generations." We ALL have family stories passed down through the generations. (Wanna hear some of mine?)
And yet there's this rule that was generally (and unfortunately) accepted as truth:
"The one-drop rule is a social and legal principle of racial classification that was historically prominent in the United States asserting that any person with even one ancestor of sub-Saharan African ancestry ("one drop" of black blood) is considered black (Negro in historical terms), its implications of racial purity being that anyone unable to pass for white in the context of the US racial hierarchy is assigned the lower status of being non-white or colored. This concept evolved over the course of the 19th century and became codified into the law of some states in the early 20th century."
https://en.m.wikipedia.org/wiki/One-drop_rule
Why can't we give Elizabeth Warren the same "authenticity"? And hey, send your saliva to Ancestry to find out who you are.