I get the "are you Jewish?" thing alot as well, which irratates me to no end in all the assumptions that represents.
I get the "what is she?/are they?" comments in regards to my daughters when my husbandisnt with us. I usually respond with "a girl!" or "human!"
Im caucasian American and my husband is a fairly light skinned Mexican.... But in our very white neighborhood back in the US people thought my daughters are sooo " tan" . We now live in Mexico and everywheere we go people call the three of us girls "gueras" /white . Funnyhow things change dependingon context, isnt it?
Im so sorry that there are so many prejudiced people out there. We are all beautiful, no matter our "mix" .