SSPPOOIIIILLLLERERRRRSZS
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if i remember correctly, both nora and jeremy kinda digs through the history btwn johannes and shuri. They find out that Johannes had abused Shuri and fingures out that this mightve been the cause of her sleepwalking. Jeremy is devastated over this due to the fact that him and his siblings have always admired their dad and thought of him as a wonderful man. I think Jeremy and Nora decided to keep their discovery to themselves though and kept it hidden from the other Neuschwanstein siblings so they can keep thinking of their dad as a nice person.
Gimme spoiler pls