The Coffin of Andy Short answer: Yes. Andrew Graves (Andy) and Ashley Graves (Leyley) are brother and sister. Andrew is the older sibling and Ashley is the younger sibling. That is not a fan theory — it is the central fact of the game, stated in the story, in the characters' shared surname, and in how every other character talks about them.
Why people ask
People ask this question for two reasons. First, new players sometimes encounter fan art, discussion, or ending summaries before they play, and the siblings' closeness can be confusing out of context. Second, the game's most discussed route — the Love Route — leans into a romantically coded version of their bond, which makes some players wonder whether the characters are actually related, or whether they are a couple who happen to share a surname. The answer is that they are siblings, and the Love Route is controversial precisely because they are siblings: it explores a codependent, possessive bond between a brother and sister, not a normal romance between unrelated people.
How the sibling relationship shapes the story
Because they are siblings, Andy and Ashley share a home, a history, and a set of family rules that no outsider fully understands. They are the only people each other can rely on, and that reliance makes it hard for either of them to leave, to say no, or to imagine a different life. Their loyalty is also their trap: protecting each other can mean harming other people, and holding on to each other can mean refusing help from outside.
That is why the game is so uncomfortable to play, and so hard to stop thinking about. It is not asking you to approve of what the siblings do. It is asking you to understand why two people who love each other might make terrible choices together — and what it would take for one of them to choose differently.
What this means for fan content
Because the characters are siblings, fan material that romanticises their relationship is controversial in the community, and adult fan material about them is strictly 18+ and unofficial. We discuss that in general terms on our 18+ themes page, without hosting or linking to explicit material. If you are new to the game, the best way to understand the relationship is to play Episodes 1 and 2 yourself, starting with the episodes overview and the characters guide.