An old man comes into a supernatural bar and sits next to a vampire—not knowing that the supernatural is a thing—and orders “what they’re having,” not realizing the bloody Mary isn’t the bloody Mary he thinks it is. When he takes a drink, he gags because ew gross. Everyone at the bar flips their shit because there’s a human in their territory and they’re all horrified that he isn’t a vampire and just drank blood from some poor woman named Mary and holy shit a human has discovered us.
And this guy, while grossed out because that’s the worst bloody Mary he’s ever had, is some old ‘Nam vet and has seen some shit in his day so so what? Supernatural is a thing. Y'all didn’t see what he did when the guys got bored and tried to make up games to keep their minds off of the hell they were in, or the cruelty of man when people looked the other way in war.
So, these supernatural beings decide that they’re totally adopting this human as an honorary supernatural being and that he must be protected at all costs. The old lady witches knit him blankets and sweaters with protective spells and bake him cakes with potions mixed in for his arthritis. The vampires help him sleep at night when the nightmares start, lulling him back into a state of calm with their hypnotic abilities. The werewolves keep him company on the nights of full moons—or in the winter—by curling up in a big cuddle pile on the couch to keep him warm and bring a smile to his face. The children with black eyes pretend he’s the grandpa they never had and make him crafts for grandparents’ day, fathers’ day, his birthday, and Christmas—with the occasional random gift of whatever they find and he has a China cabinet that he converted into Proud Grandpa Display Case™ to house them all. The ghosts and zombies keep the vandalizing teenagers away from his house. The fae and gnomes tend to a garden they made him to rest in in his backyard. The satyrs play music with him when he fiddles or whittle wood or make model boats with him for father/sons/daughters bonding time. And if any of these people get married, they ask him to escort them down the aisle like a dad would for his daughter.
And his human family doesn’t really pay much attention to him. He hasn’t been totally forgotten by his family, but they’re never there and rarely visit him because of the distance, and it breaks his heart, but if these strange people want to pretend to be his family, dammit, he’s going to treat them with the upmost respect and love like any good Grandpa would. He’ll spoil them rotten with sweets and playing horseshoe with them—because they’ve never heard of that game and are fascinated, but he has to get horseshoes that aren’t iron for the safety of some of them.
And when he dies, they’re broken hearted of course, but he loves them enough to stick around, so ghost grandpa is born and everyone celebrates his Death Day and welcome him officially into the Family™.
But yeah, this idea popped into my head and I wanted to share it with you guys. That Grandma and her demon “grandson” post sort of inspired this, though I don’t have a link at the moment to it.