I suspect that the dad had been conned by his brothers while he was in the US and he sent hit men to kill his 2 brothers and one of his nieces. One survived but he was confined to a wheelchair after the attack. This was a revenge killing by the brother who survived and the families of the other slain brother and niece. Cops have given up on the 5assailants previously suspected and now say that the son acted alone but how when he did not even have defensive wounds? DCI needs to investigate further to avoid further retaliatory attacks among the surviving family members..