What's the "right" way to ask about your children's ethnicity or race?

I really enjoyed reading everyone's comments on my last post about ethnicity/race here... but now I am curious...

What is the "right" way to ask questions about a bi-racial/multi-racial (or not-so-obvious ethnicity/race) child's ethnicity/race? Especially if the child is only with one parent and it's not obvious, or if the child is adopted from a ethnicity/race not the same as both or either parent. Or is it even Kosher or PC, to ask about ethnicity/race anymore?

Some of the wrong ways might be:

Is your child adopted?

Is your wife/husband Oriental?

Is that your friend's son/daughter?

Are you the nanny?

Is he/she from China?

Where is your family from?

If you are the parent of a multi-racial or biracial child, how would you prefered to be asked about your child(ren)'s race, if at all?

 

- Mary