I like that one, aculady! I might borrow that.
I think Shari's right, Cecilia--keeping it simple likely will work the best. Could the teacher just say he is homeschooling certain subjects? Or is working on those subjects independently?
When the lads feel like winding people (with good senses of humour) up, they tell them that they go to a very exclusive private school for boys, with a pupil-teacher ratio of 3:1 (then everybody rolls around on the floor laughing). For the random sorts of people in the grocery store lineup, where we really don't want to get into it, we just say they go to "The X [our homeschool name] School." You could name your homeschool, too?
Sounds like a good adventure, Cecilia--have a great time!
mm