Supervision of Executors

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My question involves estate proceedings in the state of: New-York

MY father has passed away 2 years ago. He has nominated 2 executors to his will. Unfortunately it has been 2 years and the executor is still trying (according to them) to settle any disputes between the beneficiaries, while liquidating the majority of the assets.
I would like to know if there is any government body that oversees the actions of the executors to make sure that they are indeed valid and are carried out in the best interests of the beneficiaries.

I live in Canada so the US legal proceedings are quite foreign to me in nature, but I have a strong feeling that the actions of the current executors are not legitimate, since they are selling properties bellow the market value, etc.

Any help would be appreciated, even a tip on where to start.
Thank!

RS

[Mr. Knowitall]

The probate court (the judge) oversees the actions of the executor.