The fact of the matter is that it was quite possible that the extended family members weren't aware of Sheila having "gone beserk " on a few occasions whereby if JB hadn't been present at WHF at the time of these scenario's happening,,then Ralph would automatically phone Jeremy for help/assistance to calm Sheila down.
I doubt if any of these " outbursts " were ever told to anyone,as Ralph was a private person and held in high regard. It would have been against his better judgement to have let this sort of a " scene " get beyond the immediate family.
It's no wonder JB had told the police that " she was mad ",,,,he'd seen it all before,,and back then there was little understanding about such a condition.
This is why,on the night/morning of the murders that Ralph phoned Jeremy before the police,,,thinking that if Jeremy was there,between them they'd be able to calm Sheila as they had done before,,,,because if Sheila had heard mention about the police it would have inflamed the situation further.
Hence the fact that Jeremy was in no particular hurry to get to WHF,,because of past events where they've been able to calm the situation.
But this time it was different in that Sheila had a gun,,,to which Jeremy had thought it was nothing more than a threat,,,but before JB himself rang the police,he rang JM asking her did she think he'd be doing the right thing in calling the police in,,,,which we all know he did after he'd spoken to JM.
JB,must have got the shock of his life when he reached the farmhouse,,,to learn that it wasn't just one of Sheila's usual threats and outbursts. He was visibly shocked and shaken to realise the extent of what had happened.
However,,,with the shock and trauma that JB must have suffered,but hadn't got time to show with the police presence there,and then coupled with a forthcoming trial,,,he gave the impression of being void of emotion,,etc. Which wouldn't have been the case. How does anyone know how a person feels,or what they're thinking.? He was now being nailed for something that clearly he didn't do,,and probably at the time,,couldn't understand.
I am quoting a passage written by Sir Arthur Conan Doyle, who showed the weakness of this category of evidence when he wrote,quote " it must be confessed that circumstantial evidence can never be absolutely convincing, and that it is only the critical student of such cases who realises how often a damning chain of evidence may, by some slight change,be made to bear an entirely different interpretation," unqote.
It was circumstantial evidence that convicted Jeremy Bamber. The question is,did the police interpret the evidence in the correct way,or could the very different interpretation, that Sheila Caffell committed the murders before killing herself,,,be correct.?
The jury had no knowledge of who would therefore benefit from JB's conviction. RB,,DB,,,and AE,had frequently visited the police and accompanied them to WHF.