Pretty sad no one told you your grandmother had passed away for a week.
Made me think of this though.
Maybe around 2002 was out in CO for a week visiting a lady friend. Was there for 2 days and just felt odd about being there. Something just made me feel like I should be home Couldn't explain it. Decided to change my flight and return home the next day.
Returned home without telling anyone in the family. Got in late and everyone was asleep. Within minutes of walking in and putting down my luggage the phone rang. Was my aunt calling to tell my mother that her father had just passed.
And if you got that strange feeling and didn't go home, the next day they would have told you about the call and you would have said "I knew I should have gone home!"
And if you got that strange feeling and didn't go home and he didn't die, you would have
A) forgotten about the strange feeling and it wouldn't have been strange at all, or
B) found something else to attribute the feeling to.
I'm missing the point of your anecdotal story. What would have been interesting is if you would have gotten a strange feeling "oh my god my grandfather just died!" and then the phone rang saying he died. But getting a strange feeling then finding something to attribute it to isn't strange at all.