From what I can make of cases where mothers have killed their children there has been an element of premeditation(Theresa Riggi called her husband to let him know his children were about to die by her hand,Lianne Smith took her children to Lloret de Mar for a last holiday before smothering them with a plastic bag),the only time I can ever recall a gun being involved was Catherine Murch who had bought a gun two days previously. Jeremy's story about June wanting the twins adopted or taken away from Sheila is so obvious a lie,as Colin knew and said instinctively that first morning in Goldhanger,as I suspect the story was about Sheila having to use a NHS hospital after any subsequent breakdown. June was at this stage in her life not set for any confrontation and would not have mentioned it. I find it difficult to envisage Nevill confronting his daughter with any of this as it was out of character with the man who spent hours reassuring her on the telephone that things would work out for her.
Of course I'm not saying Sheila wasn't a concern for her parents-of course she was. But you have to weigh the odds of an incident happening to all five family members staying under the same roof that August for the first time since Christmas 1984,when we know from Charles Marsden that Jeremy had speculated out loud to him that if the farm burned down during that period then everything would be his.