My sincere condolences and I hope your dad passes peacefully. The one thing that has always given me solace when a loved one has died, is that they always live with me in memory.

I was blessed to have my Grandfather around until this year (he died just a few months before turning 90,) but I know I'll always hear his voice giving me guidance. 

When people have a strong impact on you (as it sounds your father has surely done) then they will always be with you.