How do I let go of my brother and hopes that he will have a change of heart when I know he will not?

If you go to www.youtube.com and search this video: "The Last Song" by Elton John...it makes me cry because this is how I felt everytime my brother would come and visit me while I was hospitalized. Even though as the lyrics in the song say "talk about things that were never spoken" or something like that...this never happened with us. I always saw my brother as being both my dad and my brother at the same time. This is why it is so freaking hard to adjust to not having my brother/dad in my life anymore.