He's certainly more mature than the children, but his relationship with Ib isn't really fatherly as much as it is brotherly. Garry also doesn't quite seem mature enough to be a grown-up.Where does it say that Mary made the writing? Writing can appear after she's dead in the Bonus Dungeon, and we know that one doll was writing for Garry.Though, to be fair, Mary does ask Ib if Garry is her father - but since she doesn't seem to know much about real humans in general, she may well be ignorant and just THINK Garry's an adult, or perhaps teens and adults are basically the same in her eyes.She must want to get rid of Garry not because of his age, but because he's a rival for Ib's attention and affections. Now, at first glance that may seem to foreshadow what will likely happen to Garry - Mary seems to hate adults in general, and Garry being one would explain why she tries to get rid of him (and succeeds in most cases) - but since she herself brought Ib and Garry into the twisted gallery world, it would make no sense for Mary to bring in an adult. In the gameplay there are sections of text on a wall, presumably written by Mary, inviting Ib to be with her in a world with no adults.While people seem to think Garry is a young adult, most of the evidence given indicates that he's likely a minor, probably 16 at most. Garry is not an adult he's maybe a high school junior at most.

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