[Margaret Pilkington]

If a family member committed this crime and let him carry the can thinking he would either get off(because of his youth/mental issues) then this has badly backfired on them.

The trial was halted because of someone faking a confession....the authorities knew the confession was faked as the person confessing knew none of the salient details of the murder.

He has been convicted by a jury....who had to be satisfied of his guilt 'beyond reasonable doubt'.
Had they had any doubt once the full evidence had been heard, they would have been honour bound to find him 'Not guilty'
This was a unanimous verdict.
We can listen to rumours, we can make any suppositions we like, but we were not there to hear the evidence provided by the prosecution....so we cannot second guess the verdict.

If new evidence comes to light, or if the deed was committed by someone else in the family and their conscience plagues them, then the las will be exonerated.
It is a very poor family that would finger a barely adult member to get away with something like this...a crime with no motive.