In reply to the young boy’s question, your daughter-in-law should have said “Ask your Mother.”
That probably would have worked if she was at a party and he said that, but she had 20+ kids listening to him and she had to do something that let the other kids know that he was in trouble. Plus, she was in shock that he said that. When she told me I said, "Are you kidding me? He really said that?" And she said, "I wish I were kidding."
She is a dedicated teacher and has wanted to do that since she was a third grader. It's too bad that some parents aren't doing their job.