Mistaken Identity
Grandma admitted on her deathbed that her maiden name wasn’t Asher (English), it was Oscher (Jewish). Confirmed by DNA testing my dad. My grandfather was off-the-boat Irish, so my dad spent his entire life thinking he was half English and half Irish.
The DNA test said 49% Irish, 50% Ashkenazi, so grandma was as ethnically Jewish as can be. In retrospect, my dad and grandma had a set of about 20 Yiddish words that they’d use in casual conversation, but we always assumed that was just a Queens thing.