passing away of the professor

my dad called me early this evening, while i was still at work and told me that my grandfather, who has been in the hospital for the past few years, passed away. my dad said i may have to go to taiwan for the funeral if it's okay with my work. i'm sad, but i didn't cry. i don't know if it's because i'm insensitive or because i didn't know him that well. i knew he was a great man. he was a professor of agricultural engineering at taida, taiwan's most prestigious university. sometimes, i thought my grandfather had more in common with me that my dad has with me. my grandfather also was a martial artist, a kendo practitioner. my grandfather appreciates the study of common folklore like i do. my grandfather may be the closest person in my life to have now passed away.