When was this? What are you referring to? Jeremy had a free house and car for starters, as well as a well paid job and a guaranteed career.
A career he apparently hated.
They educated him hoping he would make something of himself. He was too lazy to so so and thus ended up working on the farm. He hoped he would not have to do much work and just collect a paycheck for nothing. Instead he was forced to work. He was given a place to stay and car but forced to work to keep these things. He was at the mercy of his fmaily. If he said he wasn't workign anymore then what?
He would have to go get a job elsewhere that paid him less and he would have to pay for his own room and board to boot. Talk about resentment feeling you are stuck in a deadend job working for your parents because they won't pay for you to live in London without having to work like your sister.
How much work would it have been for him to strike out on his own in London starting out small and working his way up to a very well paying job so that he could afford to buy his own place etc? Far more than he wanted to do which is why he decided he wanted to work on the farm in the first place.