Grandpa Misses Grandma Day!
Today, Grandpa feels like it can't get much worse, but he feels that way every day. Your Grandma died in her sleep a year and seven months ago and he's had no problem filling the hours. He's got money and he's been spending it (why leave it all for you?). But he just cannot stand not having Grandma with him. He keeps looking to his right. She's been dead almost two years but he keeps looking to his right to crack a joke.
And he sometimes gets really, really pissed off. That's why he got so wasted at your son's fifth birthday. He was literally angry at everyone in the family crowding together and running up to hug him and acting like they had a right to his attention. "Mona isn't here," the words kept running through his head. "Mona isn't here. I'm hers and I'll give nothing of myself to anyone but her." Then he stood up from the picnic table and fell down on the ground.
There's really no helping him out. When you're as old as he is, the cliche "time heals all wounds" only draws attention to the day you're gonna die. Just let him miss her, he wants to.
Happy Grandpa Misses Grandma Day!