In short the relatives needed answers regarding -
Contact shots during the massacre.
Blood already on rifle nozzle.
Photos of aga.
Lenght of rifle with silencer.
Lenght of Sheila's arms.
Other evidence showing guilt/innocence.
Police checks already carried out on silencers.
Where to get Sheila's blood.
How to insert Sheila's blood.
If unable to get Sheila's blood, what was her blood type.
How to effectivly scrape the aga to replicate a scrape during a random fight.