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Being able to drag the items between the siblings is actually technically a bug. We half-fixed it (and thought we fully fixed it, but were wrong. We found that out too late and didn't have time to fix it before submitting), which made it more difficult to do, but still very much possible.
The intended behavior was for you to have to carefully decide which sibling gets which ability, and not be able to change it later.

(+1)

I guess I've been overthinking the puzzles the whole time, given that it's possible to complete them without dragging the items. Still a great game.