It all sounds absurd to me. If Jeremy really didn't want to be a farmer, why was Nevill persisting with the idea that he must do it? Jeremy of course could have walked away, but why did his parents not discuss with him what he'd like to do instead of trying to fit a square peg into a round hole? I know that June's family in particular were all into farming - don't know about Nevill's relatives - but there are other things besides farming. Instead of buying land because Ann wanted them to, why didn't they talk about their own children's future and try to sort things out?
Is it possible that Jeremy actually liked farming, and that all this stuff about him hating it is nonsense?