So you regularly have conversations about children/health/development, you have 3 children with a range of needs, you're a GP, your wife's a teacher and you're judging people instead of really thinking about what might be lacking or have gone wrong in their lives, or what special needs their kids might have, that they're regularly feeding their children these cereals? You're just now noticing these cereals are being sold and making a rock solid link to childhood obesity? You see patients, day in and day out, presumably some obese and you've never had a good hard think about the factors that might be going into it?
I'd say if that's your approach, you must not be great at your jobs. If you think lack of understanding of diet is a problem, you're uniquely in a position to do something about it. Why don't you, as a GP, set up a programme in your surgery to educate your patients, give them the tools to make better choices, assuming they can afford to turn on their hobs to make porridge, keep fresh eggs, afford healthy whole grain bread, etc.
And I'm not coming from the perspective of someone who gave my kids that for breakfast, although they do occasionally like a bowl for dessert, among the many and varied home cooked and healthy foods they like and regularly consume as part of their balanced diets. I'm coming from the perspective of someone who understands that not everyone has the education, time, money or resources that I do, that I'm very fortunate in not having kids with special needs or dietary requirements, and also that moderation is possible in all things.
I'm not sure if I've said this before, but seriously, give your head a wobble.