Bamber was found guilty in a court of law some 3 decades ago. The motive accepted by the courts was greed and a desire to fast forward his inheritance. It is against the law to benefit from the proceeds of crime. Therfore his inheritance passed to the relatives. On what basis do you they should be facing life sentences?
How easy a motive it was for people to say " he was greedy and did it for the money " What rubbish !
Though JB wasn't particularly clever, he was intelligent enough to realise that committing something such as murder would have voided any forthcoming inheritance.
The pic. of Sheila's hand tells us that it was either a defence mark or she'd been involved. Defence in that she'd picked up a rifle against her foe or she'd spent some time with the rifle that it caused the trigger to dig in with the pressure of holding and using the rifle.
If she'd been defending her children, as you would, then the attacker would be shot/ injured, no matter what the consequences. An animal protects its young.
Anyone with half an eye can see that there's been pressure put on Sheila's hand.
There were TWO rifles so if JB had been present at all he'd have been walloped with one of them if taken by surprise. Someone would have attempted out of the three adults !