I have to agree Lookout, but I do believe they were convinced that Sheila wasn’t to blame, I would think any family involved in any tragedy like this, would see things different with what they found unbelievable circumstances as the story unfolded.
I'm more than aware that most would have pointed a finger at Jeremy in favour of his sister but those involved in the investigation were very wrong in pre-judging that " it must have been Jeremy " and come the trial which was so one-sided that Jeremy never stood a chance even his defence let him down when Rivlin could have done far more for him. The whole thing disgusts me from start to finish.
There's more than one way to skin a cat, in other words the whole family should have been interrogated, they'd have soon got to the truth of why they wanted Jeremy locked up for life.