Did he say your grandmother was a religious or ethnic Yehubor?
The TOZ view is that the Gods don’t accept Yehuborim, but if you feel good when you pray to the Gods, that is a sign you aren’t Yehuborim.
Your father could also be wrong/lying to you.
What matters most is if the Gods accept you or not. Meditate and connect with Them more to get a more definitive answer. I don’t think it’s possible for a Yehubor to genuinely connect with the Gods or love Them.
I was worried of having Yehuborim ancestry as well due to my Semitic heritage, but I was told energetically “You’re not Yehuborim”, as if They spoke to my aura. I also have empathy and a strong sense of fairness, something Yehuborim lack which is evident since they enjoy talking about commiting infanticide, that’s another way I confirmed to myself I’m a Gentile. They’re naturally evil.
If you have empathy and care for others, that’s another strong sign you’re not Yehuborim.