Ds1 and his friend passed through the house to drop their school stuff off, grab some things they needed for a project, and dashed off again. I was out fetching ds2. I come back to find the house lit up like a Christmas tree, virtually every room including rooms which they had no reason to enter (the study, dd's bedroom), no curtains drawn, toys on ds2's bedroom floor (which had not been there this morning).
They are due back any time now.
Is there any point in talking to ds1 about this? And, if I do, should it wait until his friend goes home after supper tonight?