This may be the first time I agree with one of your posts.
Where does the one-third come from?
On the first page of the thread David links to, Mike has posted up a note of the COLP interview of Peter Eaton.
What Peter told COLP about the land is this:
He, his brother and his mother inherited land from his father, John, split three ways. (As an aside, John was the one who punched Nevill, but that was an entirely separate incident, I believe. This is often wrongly blamed on Peter).
Peter and his brother split the mother's one-third equally - i.e. 50:50. (I incorrectly referred to it as one-third as for some reason I had in mind that there were three siblings, but on looking again in fact I see there were just two, so the split of the mother's land is half - it doesn't change the point, though).
The half of the mother's land that went to the brother, is what Peter persuaded Nevill to buy into order to stop his brother selling to property developers.
My point is that, when you take all this into account, it means that Peter and Ann Eaton own their own land, plus half of the land inherited from the mother. Even if Jeremy knew about the Eaton land that Nevill owned and intended to sell it, the Eatons retained ownership of most of their land. Jeremy could not have ended their livelihoods.