I’m sorry about this, it just came to me
So Soos’s grandma basically said Soos’s grandpa went to hell.
And if you look around Soos and his grandma’s house, you see that all the photographs in the house are of Soos, and not of, like say, his parents. And many of those pictures were from when Soos was a kid, so this implies that Soos’s grandma raised Soos all by herself.
So my theory, what if Soos’s grandpa killed Soos’s parents and that’s why he went to hell?

I’m sorry about this, it just came to me
So Soos’s grandma basically said Soos’s grandpa went to hell.
And if you look around Soos and his grandma’s house, you see that all the photographs in the house are of Soos, and not of, like say, his parents. And many of those pictures were from when Soos was a kid, so this implies that Soos’s grandma raised Soos all by herself.
So my theory, what if Soos’s grandpa killed Soos’s parents and that’s why he went to hell?