omg, i'm so sorry!! i know how hard that is, ive had a couple similiar expiriences over the last couple years. my grandma was diagnosed with cancer and i remember the day i heard that she wasnt going to get better, it was seriously horrible, i didnt stop crying for the longest time. and my friend had been battling cancer for 2 years when they said there was nothing they could do but just send her home, she died on her 17th birthday. and now i'm expiriencing kinda the same thing with my brother... i know how hard it is... knowing someone is never going to get better is horrible, cause you want them to, but there is nothing you can really do. but you cant really concentrate on that, just be glad he's still with you and make the most of it! its the only thing you can do!
if you ever need to talk... i'm here! i dont really know you, but i'll be praying for you and your family.
**Hugs**
oh and one more thing, always say i love you and give hugs! one time when i was visiting my grandma i was leaving and i wanted to give her a hug, but she was eating and i had my hands full so i just thought "i'll give her one next time" and left. that would of been my last chance to and i regret passing it up, even a year later i still do! so just make every moment count with him!