I never knew my grandfathers but I dreamt about both my grandmothers after they passed. The first was my nana. She died while I was at college, going through a pretty turbulent and trying period of my life. She basically said to me that I was perfectly normal and that everything would be all right. I woke up very relaxed and comforted. When my gramma died 14 years later, I had a dream about her old house, it was night and no lights were on. It was a brilliantly lit moonlight sky outside the windows and then I saw her sitting in a rocking chair looking out. She said to me "I've always enjoyed the moonlight and the stars." I didn't know this about her and when I turned to say something she was gone. The pang of loss was so sharp it woke me up and I was crying. My dad passed in 2006. I really miss him and I cried a lot. A few months go by and I had a dream where I met him, in a younger version. He immediately knew it was me and we joyfully reunited. He was actually younger than i was at that time, probably mid 30s, dark haired and still slim. I was nearly 50. We both marveled seemingly reversal of chronology. There was something so real about these dreams. I haven't had any others like them since. I've had other dreams of my dad since then where I'll suddenly realize he's not living anymore and I must be dreaming. Oddly enough I do not find them sad.