Conversation so far:
what's the meaning of the movie the boy
what is the twist in the movie the boy
The shocking twist is that the real Brahms didn’t actually die. He has been living between the walls of the house the entire time.
what happened to brahms' parents in the 2016 film the boy
The Heelshires, Brahms' parents, write a goodbye letter to Brahms, then drown themselves.

Question: why
Self-contained rewrite: why did the heelshires drown themselves in the 2016 film the boy