Hi Richard, I just commented on your writing before I saw this question.
ลูกครึ่ง is a very common descriptor when each of your parents is of different nationality/ethnicity. ผมเป็นลูกครึ่งไทยฟิลิปปินส์ (I am half Thai and half Filipino.)
July 3, 2015
You could say, "I come from many backgrounds", or "My heritage is very diverse!" :)
I am a teacher on Skype, please make a lesson for more answers!
July 2, 2015
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