Today is St. Patrick's Day. In America we say that today, all of us are Irish.
I have approximately 5 liters of blood in my body. By ancestry, almost two liters of that blood has Irish genetic origin. But, the only Irish culture I know is fed me by Grannymar.
My mother-in-law can claim the whole package if she wants, though. She was left on a church doorstep in a basket. On Chinese New Year, she gets to be Chinese.
She doesn't know anything about being Irish, either. But, we both celebrate anyway - so, maybe we ARE Irish!