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(1 edit)

Have a look at the books in the living room to get somethng that can work like a cleaner.
If you mean the door on the left next to the stairs ... use a hook that you find somewhere to unlock it.

I hope it helps. For the first half there is a walkthrough on YouTube further down in the comments.
Part two is here:

(2 edits)

I must admit I missed the hook but the book one is misleading.

Also, that playthrough is only like 1 step ahead of me. Your sister showing up should be flagged somehow, otherwise there's no reason to go in that room...

I found a walkthrough via Gamejolt though. Thanks.