Why does Napoleon educate the pigs?

Napolean is a very wise leader who is a pragmatist and that is why he wants to keep a division between the pigs and other animals on the farm. Napolean tries to put himself and his family on a higher pedestal than the rest of the animals and that is why he seeks to educate the piglets that he fathered because he would like to keep his legacy. Napolean wants to give his children an advantage over other animals. This in truth highlights the importance of education for a demagogue who uses the narrative of the body over mind for other animals but when it comes to his own children he prefers that they get educated.

In chapter nine, four sows give birth to a total of 31 piglets, all of whom were fathered by Napoleon. Shortly after, Napoleon decides to build a schoolroom, solely dedicated to the education of these piglets. What is interesting about this decision is that the farm is running very low on funds. Given the dire financial situation, then, Napoleon must have a strong reason for educating these pigs. Although no single reason is given in the text, we can use our wider knowledge of Napoleon to infer his motivation for educating the piglets.
Firstly, educating the pigs helps to reinforce the social division which exists between the pigs and the other animals on the farm. Remember that none of the other animals have received any education since Snowball left the farm. For Napoleon, their value is derived from their labor, not from their minds. Educating the pigs, therefore, sends a clear message that the pigs are socially superior to the others.
In addition, educating the piglets is also about legacy. By educating them, Napoleon guarantees that this clear social distinction will continue long after his death because these piglets will have been educated accordingly.
Thirdly, educating the pigs is an important part of maintaining the pigs' role as leaders on the farm. Remember back in chapter three when Squealer referred to the pigs as "brainworkers"—it is his justification for stealing the milk and apples. Educating the pigs, therefore, enables this stereotype to flourish because it supports the idea that the pigs are the most intelligent creatures on the farm. Education, therefore, enables the pigs to maintain this allusion and, in the longer term, maintain their power.
Finally, by educating the pigs, Napoleon is able to protect and maintain his own power base on the farm. Note that in chapter nine, the narrator says that he takes personal responsibility for teaching these piglets. By doing this, he is in total control of the educational and social agenda. He can tell the piglets whatever he wants to without fear of being contradicted by anyone else. Just as he trained the puppies to be his personal bodyguards, Napoleon can teach these piglets whatever he likes. He is, therefore, molding the next generation into whatever he chooses, and this is one of the ways in which he can personally preserve his absolute power on the farm.