Again if the children were shot last wouldn't there have been the danger of then waking up? Scipio said that if that was so then Nevill and June would have woken up. Well maybe that is exactly what happened, since they were both found out of their bed? The children on the other hand were apparently sleeping soundly and undisturbed.
You ignore that June was shot in bed and did not make it far from the bed before being killed.
If he shot the twins first he would have only had 2-3 shots remaining when the parents got up and encountered him. Had that happened they would not have been shot in their bedroom and June certainly not shot in bed. Then encountering his with only 2-3 bullet sint he gun would have been a big problem and woudl likely have resulte din him being subdued and the police called.
Kids usually sleep through more than adults and kids don't have guns let alone the physical strength an adult does so it makes far more sense to risk the kids waking up than the adults.
Either way he had to risk Sheila waking up but knew from taking her home that she was tiring fast and probably would not have been an issue. His biggest problem with her might have been waking her up and getting her out of bed. But if he was worried about her then even more you want the adults out of the way. Why not shoot 5 into each in the meantime if shooting them first?
But let's go with your specualtion (excluding the unsupportable claim the parents woke up and confronted him outside their bedroom because they were shot in their bedroom and June still in bed when it started):
1) Fires 8 rounds at the kids, 1 bullet left in the chamber, 1 in the magazine
2) reloads another 9 rounds in the magazine so gun has 11
3) goes to master bedroom and fires 11 rounds into the parents
4) after Nevill unconscious loads 6 rounds into the gun
5) fires 4 rounds into Nevill
6) used last 2 on Sheila
For this to work the parents can't have woken up and left their room or would have busted him which he was reloading but instead were surprised as he entered their bedroom with the gun.
Either way you slice it while the first shootings happened the other can't have immediately gotten out of bed and rushed out to encounter the killer or things would have went down significantly different than they did.
It would be too stupid and foolish to not kill the parents first. I can't see him not viewing them as the greatest threat.
In the meantime how can the phonecall to Jeremy fit in ever?
The phonecall allegedly was made before any shooting occurred.
The only way the phone would be left off the hook would be if Sheila forced the phone to be off the hook, Nevill would not want to do that on purpose so Sheila would have to have bene there with him.
Why would she march him upstairs to his bedroom instead of killing him there in the kitchen? She was supposedly out of control and out of her mind so marching him to his bedroom so she could kill him and June together doesn't work.
Goin to kill the boys after making him hang up the phone surely doesn't work because then Nevill could have jumped her as she ried to reload and she only would have had 2-3 bullets left.
The only way the phone clal coudl seem plausible would be if Nevill had been shot in the kitchen right after that call which is what Jeremy hoped people would believe. But if the shooting started int he kitchen the struggle never would have happened, the struggle happened because the gun was empty. The gun was empty because it was used upstairs first and indeed Nevill was shot upstairs before the kitchen. All of this helps reveal the phone call to be complete fiction.
Trying to work the phone call in the mix fails no matter what you try to do when taking into account the 4 shooting episodes
-Nevill and June being shot in the bedroom
-Nevill shot in the kitchen
-twins shot in their beds
-Sheila shot in her room
potential 5th episode of June being shot some additional times
The phonecall had to precede all of these
The shooting in the master bedroom of June and Nevill had to precede the kitchen shooting
How do you get from Sheila being in the kitchen with Nevill making the phone remain off the hook and arrive at either:
A) Nevill going to his bedroom and June still remaining in bed while Sheila goes and shoots the boys in their room with 2 bullets left, goes downstairs and reloads and then goes into the master bedroom to shoot her parents. Nevill would have simply stayed in his room with June still in bed while that was going on and wait for her to come for them next?
or
B) March Nevill to the master bedroom and shoot her parents, then the kitchen murder and finally kill the boys before killing herself.
I can't see either as happening least of all June staying in bed as Sheila is running around with a gun.
When the phonecall can't fit in that is a huge problem, the phonecall makes no sense anyway but especially in light of how the murders were carried out.