The cave with the skulls and the bones was where mother kept the juice.

[fgadmin]

Archived from the IMDb Discussion Forums — Goodnight Mommy

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jonvena — 9 years ago(July 10, 2016 10:20 AM)

That's where she hid the juice. She knew Lukas didn't like juice so she refused to give them to him.
I don't like juice myself.

[fgadmin]

romanhuelsewig — 9 years ago(July 25, 2016 06:54 PM)

I don't get what you mean

[fgadmin]

LexKim — 9 years ago(October 11, 2016 06:51 AM)

Get help

[fgadmin]

at7000 — 9 years ago(October 25, 2016 09:40 PM)

Their vacation house was built upon the ruins of a Nazi concentration camp. That explains all the Jewish bones and skulls.