Great topic. I have a 22-month old son (first child) and boy, I did not think it would be so demanding! It is a full-time job and hard, but totally worth it.
We do a lot of hot dogs, Annie's Mac n Cheese, Chef Boyardee (sp?) ravioli, scrambled eggs, avocados, apples, pears, cereal, instant oatmeal, etc. I don't feel bad about not cooking organic food from scratch everyday...it takes too long and kids are picky. It's better that they eat.
The cleaning definitely never ends and it can get frustrating. Kids didn't ask to be born though; that was our decision, so we absolutely need to maintain composure and patience and empathy.
But as others have said, make your monthly deposits to 401K and index funds, and then don't worry about the rest. Mustachianism and frugality isn't a competition about who can spend the least. Each person and family has a unique situation and one size does not fit all. The fact that you are on this thread means you are doing a great job. Keep it up and cut yourself some slack without guilt or remorse. Let the kids be kids - McDonald's and other indulgences (in moderation) are a real treat and makes for a happy childhood.