I can tell you without hesitation that the more liberal a person is the more likely he is to comment on our 'mixed' family. The more conservative, the less likely. In fact no conservative has ever made any comment at all while virtually every liberal has felt the need to say something.
My wife is French Caribbean of very mixed blood lines (Italian, French, German, African).
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French/German??? How in the heck did that happen???
Shame. /s