How many do you think they could take on in a single wave?
The rules being either one has to die and the kid has agroed the chimpanzees. The child is in their house and has the same resources and prep time.
Bonus: here is the Wikipedia page about the Gombe Chimpanzee War.
Based on the way chimpanzees fight, and given their overwhelming strength advantage, any of the McCallister kids would simply be mauled to death.
You don’t think they could take down one?
No.