Guardian of Minor Estate

What is the name of your state (only U.S. law)? Illinois

My ex husband passed away several years ago and left life insurance to my minor son, so I have become the guardian of his estate until he is 18. He is currently attending private school and I was wondering if I would be able to use some of this money to pay for his education. If so, do I have to petition the probate court first, or do I just provide the receipts at the annual hearing?
Thank you~

My expertise is in NYS probate, but many states operate in a similar fashion. In NYS you would have to file a petition to withdraw funds for support and education. In NYS that would be under Surrogate Court Procedure Act 1713.