I'm missing two things concerning children:
1. Sims can take selfies together with their friends, but not with their children. They can only take pictures OF their children!
2. Going to a café in Windenburg ("Get together" extension), children can't order food for themselves! Parents have to buy and give it to their children instead. That's pretty impractical when the family is going to breakfast!
Doesn't really sound like a bug to me.
They would probably need to program separate animations for this and decided not to.
Please use either the Ideas Corner: http://forums.thesims.com/en_US/categories/the-sims-4-ideas-corner or the Feedback forum: http://forums.thesims.com/en_US/categories/the-sims-4-feedback over at the official forum.
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