If you read my blog you will see that we too are involved with a close relative who is suffering a terminal cancer. In our case it is a favourite 19 year old neice with a brain tumour, who is given a maximum of 2 years.
Our thoughts go out to you, as we know how helpless you can feel when faced with these realities. May I offer some advice? Try to make every day count, for what matters is the life you actually have, as none of us really knows what is around tomorrow's corner. There will be plenty of time for sadness in the coming months so try also to be happy and fun, for him and for you to ensure the very best memories.
I hope you are being helped and counselled through this difficult time, as you too need support. Our thoughts are with you.