I hope that the family get some peace soon. It's a horrible time waiting for the inevitable. 
I know the five stages of grief: denial, anger, bargaining, depression and acceptance are not necessarily linear - and they may need to go through them again once their wee boy dies - so I hope they get good support as and when they need it.
One of the best bits of advice I got when my mum was dying was that in time the painful memories of the husk she became will become less vivid and it will become easier to remember the good times with her. I hope that AE's family will be able to find some better memories of his time alive: the joy when he was born, the little milestones before the degenerative disease set in.
Dh could always tell when my mum was "better" when I visited her as I would come home more upset because I could see the glimpses of the wonderful vibrant woman she used to be. But now with the years passing, the memories of her bringing me up, of becoming, as I became an adult, one of my best friends, are now warm and stronger than the memories of the last few years of her life.