Marty’s Grandparents?

They might have died when he was young. I've seen photos of my grandparents but they died when I was little so I don't remember them.

Seeing your grandparents, you always only know as elderly in their prime can be also quite shocking/irritating.

Sidha108, Marty wakes in his mother's bedroom, so he knows that his grandparents are downstairs. He, however, has no idea that he is going to meet his parents. Lorraine is a drug addict, her father is a domineering ignoramus, and her youngest brother is in prison. Marty's maternal extended family is riddled with unstable connections, and I wouldn't be surprised to learn that his aunt and two other uncles also have major problems. The boy's mother might have stopped talking to her father and one of her siblings.