When someone loses a grandfather, you can take tips from this family condolence letter when offering sympathies.
Dear {Recipient},
With someone as effusive and energetic as {Deceased}, I am tempted to say that it was a blessing that he lived a long, full life and had children and grandchildren that he loved dearly. The truth, though, is that a century would not be enough time to have him with us, or even two. Men that gruff, sweet and generous are a rare and wonderful gift, and {Deceased} was the best of them.
I hope that you do take comfort in how much good he did here on earth and the wide influence of his strong values that can still be found in his community. Still, I know that the world is missing a crucial figure now, and I cannot express enough my sorrow for you during this difficult time.
Love,
{Sender}