Pete's principal sent this reply to our earlier email exchange:
HI MN, in CMS educational absences are at the principal's discretion. With help from the SLT we set up guidelines. Visiting family members is not excused at [this] Montessori. When you have time, I will be glad to discuss this with you.
Is it just me? I'm done thinking about this. We're going regardless so it doesn't really matter.