On what grounds did the Probate office say that probate could be reopened after 9 years?I spoke to the Probate office today and the file was closed after 2 years. He stated it could be re-opened anytime.
I'm not sure what you mean by
.He suggested that we get as many Permissions in writing and Notarized as possible, from each of the Heirs, for use of the Well and Driveway
What does the Probate Court have to do with a land use matter once the estate has been closed and assets were distributed? If the son owns the land next door, why not just ask him to grant you the easement for the driveway and an agreement for long term use of the well? I don't see where any of other heirs would have anything to say about it.
As to a form of document, I can't help you there because I don't know what you are attempting to accomplish. You could speak to an attorney or perhaps someone else on the forum understands what you are talking about.

