Yes, that's right (where a children's menu is offered -- obviously at a buffet, it's all the same food for everybody). So if you use 2 adult TS credits at Kona Cafe and save an extra child TS credit, you and/or your husband wouldn't be able to make use of that credit later on for yourselves -- you can only use it for your son. You can always, however, mix-and-match (e.g., if you're out of adult TS credits but have child ones left over and are dining at a TS restaurant, you can pay OOP for you and DH, and use the DDP for your son. Just make your intentions clear to the server at the outset.)