This is exactly the problem, bright sparks! Mom is TOTALLY catering to him! She had to keep a food journal for a few days before going to the dietician, and she brought it last week so I could record what he ate during the day. I knew they were letting him get away with it, but the journal was insane! His dinner, 3 nights in a row, was BABY CEREAL! Mixed with 2 tablespoons of yogurt. Spoon-fed. That's it! My 15-month-old hasn't eaten baby cereal in months! They're not even trying at all. I've been giving him the same thing as everyone else, and then if at the end of lunch time he hasn't eaten enough, I've been giving him baby food. I thought this was what was happening at home too, that they were at least giving him a chance to try it, but that's not even happening.
I really don't like tricking kids to get them to eat their meals. This whole idea of "hiding" veggies in pasta for kids who won't touch veggies, etc etc, is just silly. If they cater to him this much and sneak food into him now, when will they ever stop and insist that he eat what's served to him? In my opinion, it's just setting him up for having more issues with eating.
Thanks for the positive feedback; I really didn't think I was being too harsh, but it's a relief to have some confirmation of that! I'll try to talk to her this evening, because I don't want to do it behind her back, but the baby food isn't coming out in my house anymore.