Spoiler— his brother


SPOILER
If his brother was murdered by the same child killer, Why wasn’t his brother one of the ghost children?

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Maybe William Afton/Steve Ragland put Garret's body in another animatronic. He killed more than just the four that haunted the Bonnie, Chica, Freddy, and Foxy bots.

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Makes sense, thanks !!

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You're welcome.

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Someone else was suggesting that his brother is Balloon Boy, the small puppet in the locker. This could be plausible, as he appears on day 1 and the day after the murder to warn his brothers, if you like to interpret it this way.

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