I guess it does make sense for her to be an orphan, too. Hmm, I'd always rejected the idea of Raetsel having lived with them, but now that I think about it, maybe she really did? (...But that turns her crush on Charon from "sort of sweet" to "reeeeally kinda creepy".)
It might have been? Although it doesn't look much like it.

For a less skeevy option: maybe the shed is where Raetsel lived after her family died but before she left Kinkan. It would explain why she goes to stay there when she visits, and why Fakir would be familiar with it.