I think I would say at school..where are your kids? At school.

Where is your son? At college..or at school.

Now, next question..does everyone else say "I went and did it" instead of I just did it..or I went and got some milk at the grocery.
I went and got my hair cut. It is redundant but I know I say that a lot. Now I went and said it.

Reading that I realize I don't say grocery..I stay grocery store. Also, some people say they took the ferry or they see a ferry onthe water..I always say ferry boat. mg