So sorry to hear that
.
I would definately tell my parents. My gran was taken into hospital while me and my mum were in the US and my dad and grandad between them decided not to tell us at first (it was her mum). My mum went mad when she finally found out, because if she wanted to come home the decision had been taken out of her hands.
I realise they can't see him now, but they may want to be around and help with all the arrangements, and it should be their decision if they come back.

I would definately tell my parents. My gran was taken into hospital while me and my mum were in the US and my dad and grandad between them decided not to tell us at first (it was her mum). My mum went mad when she finally found out, because if she wanted to come home the decision had been taken out of her hands.
I realise they can't see him now, but they may want to be around and help with all the arrangements, and it should be their decision if they come back.