No Lesson at Easter

My first-thing Saturday morning student comes nearly every week.  Of the year.  The Saturdays closest to Christmas and New Year are usually taken off, but apart from that - unless I'm away - he has a lesson.  He's now 15, and his mum always comes to the lesson too.  At the end of every lesson, his mum asks "Same time next week?" and usually my reply is yes.  But last week:

Boy's mum: Same time next week?
Me: Ooh - actually, no, don't come next week.
Boy's mum [surprised/concerned]: Oh - why not?
Boy [in that "I can't believe I have to explain this to you" tone of voice]: Mum, it's Easter.  She wants a holiday!

Like, duh.