Page 11.
Sorry it says the twins did not wake. So may not have been shot first but remained sleeping along with Sheila.
Says Sheila was told to lay down and shoot herself. Which suggests she was woken last & lead to the main bedroom.
It was in Julies later statements that she "remembered" Jeremy telling her the Twins being shot first.
According to RWBs legal source the twins would be presumed to die last and Colin will inherit. Arlidge QCs notes say the same thing. ChatGPT on UK intestacy law says the same thing. ChatGPT has passed mock Bar exams to the 90th percentile, so is a valid legal source also.
So the inference being they got Julie to say this (directly or indirectly) and used her statement in later civil proceedings to obtain the estate. Colin being unable to make a claim without claiming that Julie lied.