Grandpa dead

My grandpa has been sick for a year now, and he just died today at 2p. I dont feel sad... or upset at all. I loved my grandpa. Is their something wrong with me or is this a stage of some sort? I never get to help him garden or make home made wine with him again. The worst part is my great grandpa is alive. I can't even imagine how he feels or what he is going through. To out live all your friends wives and now your son. 
 
They lived together and took care of each other. I hope he dosen't stop taking care of himself just because his son is gone. I don't known how to feel...