Children are incapable of deception until they are about 3 years old.
That assertion is incorrect, as another commenter has posted. Although anecdotal, my youngest grandaughter is not even 2 and has been recently caught a couple of times trying to manipulate her mom or dad into giving her attention at a moment's notice by sometimes pretending to be hurt when she was not. Being only a year and a half old, she's not particularly adept at such deception (so bad at it. in fact, that it's almost funny), but it's still quite definitely a form of lying, even if it is mostly non-verbal.
On the subject of apes, I've suggested that somebody should really try teaching an ape to read beyond the scope of a parlor trick where it is simply doing it to satisfy some immediate physiological need or desire, and hopes that by performing said stunt, it will induce its owner or keeper into giving it such a reward. The ultimate test of reading comprehension would be when it can learn entirely new skills by reading about how to perform them instead of being trained by somebody else. The new skills do not necessarily have to be complex, nor do they necessarily have to be performed expertly, but if they were able to read, they should at least know the mechanical and cognitive steps involved in the task, and be able to make what are readily observable attempts at performing them, and also be able to realize when they are not following such steps. For example, could an ape learn to play a simple count-and-capture game such as Mancala by reading the rules, even if the ape had never been taught the game by a human? A six-year old child can learn to play such a game by reading the rules (not necessarily very well, but the child will still know the rules of the game and competently demonstrate an ability to follow them even without having been instructed how to play by anyone else). If chimpanzees or other similar apes are so cognitively similar to humans, it seems to me that this should be possible.
Also... arguing that some humans can't read or write is drawing on exceptions rather than the rule when a person has been raised in an environment where that education is actually provided.