I think they have been very careful not to make any comment about what Granny Speakman was told. They are only saying that they told her the rest of the family had died. therefore if she was as bright and canny as they are making out it does not make sense for her not to ask anything. No sense at all.
So it is true unless we had statements from the legal persons and the doctor then we will not know the full truth
Just from a common sense perspective:
Original Will- to June and Pam per stirpes
Changed will- to Pam and her kids
If June and her entire fanily including Jeremy was dead:
Original will- Pam inherits
Changed will- Pam inherits
There is no difference so if Granny had been told he was dead she would have no reaosn to change the will.
The only reason she would have to change the will was if she knew Jeremy was still alive and she didn't want him to get June's half.
So it was never credible that they told her that Jeremy died in order to get her to change her will and neglect him. That explains why his case was dismissed rather rapidly and why he was order to pay costs.
There is only 1 reaosn why granny would amend the above will- to exclude Jeremy. I can only think of 2 motivations for that: 1) she hated Jeremy's guts all along and assumed June would have outlived him but upon her death figured to change it or 2) she believed Jeremy killed them
I don't believe for one second that the family tried to spare her agony and did not tell her they think Jeremy did it. I rather believe that they would be shouting it fromt he rooftops once she learned about the murders.
While it is possible she brought up the idea of changing her will on her own it is just as likely that they brougth up the idea to her. Since this is all legal and logical it doesn't really help Jeremy out much.