If you have 3 white grandparents and one non white grandparent do you consider yourself a person of colour/mixed race?

I’m curious what other people consider themselves because I have always Just considered myself white, but I have one friend who calls herself mixed.

We each have 3 white grandparents then one of her grandparents was black and one of mine middle eastern.

We both grew up in very Ukrainian Canadian families.

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Where do you think the line is for being “mixed”? How far down the chain of DNA does it have to go till you’re not? 🤔