It's an interesting game but I don't know the game ended lol.
7 of the endings are just quick deaths with no reinforcement on the mystery of the story.
Anyways, the Murderer(Dad of Anna), speaks a little bit, first they say they did it to save Red.
Red is an emotionless soul of a human, to trigger some emotion in her, the Murderer had to kill the Mother who is main source of lack of emotions.