We just bought our Christmas tree. It’s a beauty. The neighborhood tree guy has a deal with the local public elementary school: Mention the name of the school, and he gives you a 10 percent discount — and he donates a portion of the proceeds to the school.

So we mentioned the school, in the presence of our 12-year-old — even though that 12-year-old no longer attends that school. Win-win, we thought. Except the 12-year-old was aghast and told us that we shouldn’t lie. Did we do wrong?

— Humbugs