, the coffee table aspect, he was sleeping, parents watching TV, did not move, but just spoke, he awoke and lunged at my fathers hand biting...
Agree with what others have said, sounds like a behavioural issue and definitely not rage.
Just out of interest, has your vet checked for low blood sugar as this is thought to cause out of character behaviour?
Its described well in Val Strongs booklet 'the Dogs Dinner' and could give an explanation or the coffee table incident.
She says "Low blood sugar levels could give an indication of the cause of some aggressive behaviour where no other cause as been identified. Lower blood sugar levels may be party responsible for some dogs rising from deep sleep in an aggressive state, as the brain will have insufficient energy to make rational decisions. Only the primitive areas of the brain, which control basic survival instincts (flight/fight) will then be active"
well done for getting and help and i really wish you and Barney the very best of luck
sue, zak and strider x