Dear Amy: We have recently been reunited with our son’s child after 10 years. He is 13 — and is delightful, well behaved, and intelligent. However, unfortunately, he has terrible table manners. We went to a restaurant and it soon became apparent that he has never been shown how to use a knife, a napkin, etc. I didn’t want to be critical, so I tried saying things like, “I find it easier to cut my food if I hold the knife this way,” or, “I put my napkin in my lap so I can wipe me mouth,” — that sort of thing. This was met with a blank look and the behavior resumed. It won’t be possible to speak to his mother about it, and again, I don’t want to be critical. How can I teach him table manners, other than modeling good behavior? — Mannerly Grandmother Dear Mannerly: You have just met this boy.