I want to look up my grandpa's medical history.
Is there something in his medical history you're worried about?
I want to know if I'm right about the horrible sicknesses he had since he was young.
It's a good idea to check these things especially if you're worried about illnesses running in the family. Just make sure you check with your grandpa first so he knows you want to see his medical history.
No way, I'm going to go behind his back and read it.
Your grandpa should probably know about it though; he might even be willing to talk about his illnesses. It's still a good idea though especially if there is some sort of genetic predisposition to these diseases he had.