My grandparents are mixed, and my moms grandfather is mixed, am I mixed too?

My grandmother is half white, and my grandfather is half Amerindian/Native American, and my moms grandfather is African, but hes mixed, half white or:

My grandmother is half white, and my grandfather is half Amerindian/Native American, and my mom's grandfather is African, but he's mixed, half white

or:My grandmother is half white, and my grandfather is half Amerindian/Native American, and my mom's grandfather is African, but he's mixed, half white

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