I’m going to try to exposit before the chapter is over to explain this better, but here is some info that isn’t directly stated in the pages. He is her Mom’s brother, and is only about 3 years older than her, within this world there is an issue with fertility, so if a family is lucky enough to have more than 1 kid they will likely be separated by many years. So while he is technically her uncle their relationship is much more a “big brother little sister” sort of thing.

Let me know in the comments, prefer bushy Audrey or shaved Audrey? Throughout the comic will get both.