I'd like to start writing letters to my grandpa. We live far apart and he's gone deaf, so I can't visit or call him. He doesn't have much experience with technology and he's alone now, so the last option is to become penpals! What should I include in a letter? How long should it be and what's the ideal tone? I'd like the letters to be both personal and fun to read, but since almost nobody writes letters like this anymore, I have no idea what they should say!