There is no overwhelming evidence steve. We know Jeremy had trouble with June when she was struggling with her own mental illness and a manic about religion, that doesn't prove anything would imagine that is normal enough behaviour by a late teen early 20s son. Apart from that most of the rest is hearsay and no doubt the usual teenage angst etc. It was Sheila who had huge difficulties and resentment of her mother which seems to have become tragically tangled up with her own mental illness.
There are so many independent witnesses who are not linked to one another and yet when one reads their testimonies it's possible to build up a picture of Jeremy's relations with his parents:
Jeremy to Goldsmiths student James Richards: "I f***ing hate my parents"
Liz Rimington:"It's important to have money whilst you're young"(the subliminal message here is "money is wasted upon my elderly parents as they are too old to enjoy it")
Nevill Bamber:"The shooting season is coming up..accidents do happen.."
June's hospitalization and her demeanour those last few months,constantly in tears as she gave up on any instruction of her children and tried to look on the bright side,just going through the motions of existence as Jeremy and Sheila ignored her..
Robert Boutflour:"Oh no Uncle Bobby,I could easily kill my parents.."
Jeremy to Doris Foakes: "I'm not sharing any of my money with Sheila.." Had this comment found its way surreptitiously to June?
Of course Nevill and June liked to keep up appearances which were important in the village. But neither were fools and they were not fooled..