While you've been working with the boys individually for the last few meetings, trying to make sure all of them had finished all their requirements (and letting your Den Chief(s) occupy the boys who are already finished with that area).
Yesterday, one of your guys - Bowie - who is normally well-behaved and polite, was on a tear. While his step-dad and older (step-)brother have both been helping him, he had a couple of issues that he wanted you to help him with. You explained how you had things set up, and promised you'd talk to him, but not right then. For some reason, that really sat Bowie off, and he not only didn't take it well, but he was a bit bratty and disruptive.
Bowie's older step-brother, Mark, is an Eagle Scout and has been one of your Den Chiefs since their family moved into the area. After you'd given Bowie several warnings, Mark took his brother aside. The two of them had a quiet talk and Bowie settled down.
You thought that was the end of it.
Today, Bowie and Mark came back.
Before Mark could leave, Bowie apologized to you for how he'd acted the day before, and assured you that Mark spanked him for it, as soon as they get home.
You turn to look at Mark, because you didn't know Mark had permission to spank his little brother. Judging by the way Mark is fidgeting and blushing, there might be a good reason you didn't know it.
How do you deal with the issue from here?