Ruby and Max have hardly a good relationship. Their parents are most likely dead, and their Grandma apparently takes care of them. By leaving them alone in their parents house and leaving them to fend for themselves.
Max can barely say complete words, yet he is three/two. He is subject to torment from Ruby. Her antics include putting make-up on him, forcing him to eat food he simply dislikes, yelling at him for spilling milk, etc. Ruby and Max do play, though. Usually a game of tag or "super bunny:.
Ruby occasionally wears makeup and part dresses, which could be considered innuendo. Good points exist, though. Ruby cares about Max and wants to be good at whatever she is trying to do. Max simply wants to play, and is still in his innocence. There certainly aren't any good role models, and makes it comparable to a tamer version of Spongebob.