Unless you were the murderer,there isn't a hope in Hell of knowing who died in what order.
From the casings and other information we can figure out the parents were attacked first in the master bedroom, the gun was empty and that is why things were able to proceed to the kitchen and why the struggle happened there then after reloading and killing him the gun was reloaded again and the 10 rounds of that magazine used on the boys and Sheila. This information doesn't hinge on the identity of the killer it happened regardless of who the killer was.
You want to ask Jeremy questions for people ask him this for me.
"I figured out generally the order of the shots. June was shot 4 times in bed, 2 more times in the chest as she was either sitting up in bed or getting up from the bed and Nevill shot 4 times. With the gun empty the killer then either chased Nevill to the kitchen as he ran there to arm himself or chased the killer to the kitchen and then once in the kitchen they struggled over control of the weapon knocking things over, scratching the mantle and breaking the ceiling lampshade. Then the killer gained sole control and beat Nevill with with butt of the rifle gouging Nevill's arm, tearing his watch off and finally managed to bash his head knocking him out then reloaded the gun partially and shot him 4 times killing him. The killer then reloaded fully and went upstairs and used 8 on the boys and 2 on Sheila gun then empty. The only wound not accounted for is the wound between Sheila's. It was fired last after she collapsed on the floor. The question is did the killer start out with 11 rounds and shoot her between the eyes before the kitchen altercation or did the killer go upstairs with 11 rounds after the kitchen altercation and shoot her at that point to make sure she was dead. What do you think?"
Tell him that is what someone wanted you to ask him.