Apparently his mom is half Thai, 1/4 Chinese and 1/4 Dutch
His dad is half African-American, 1/4 Chinese and 1/4 Native American.
So technically by that reckoning Tiger is equally 1/4 Thai and 1/4 Chinese! He's also 1/4 African-American. It's interesting to me that that 1/4 is the one many people focus on.
I imagine most of us are "mixed ancestry" if we look back a bit!