Explanation of Peacock
I haven't seen anyone post what I believe to be an accurate explanation of the events that took place in the film "Peacock", so please let me enlighten you as to what I think happened.
John and Emma are two distinct and separate personalities. Neither ever knows what the other is thinking or doing at any time, though they are both aware of each other's existence. Emma never existed until John's "mother" died. (I used those quotations for a reason as you'll see later) When she passed, John needed to fill the void of his "mother" and did so by subconsciously producing Emma, who fulfilled his mother's duties of housework. Emma was far more emotionally stable than John because she did not share his memories or trauma from childhood.
Up until the end of the film, Emma believes John is unreasonable and selfish by disregarding Maggie's plight. She goes so far as to use John's voice to set up a meeting with Maggie, at which point she uses the body of another man to stage John's death. She shaves her eyebrows in order to further prevent John's return seeing as how he's very unlikely to leave the house without any eyebrows. This may also be an attempt to solidify herself as the dominant personality.
When Emma prepares to take snapshot of her son at the table, she realizes what John knew all along. John's "mother" was a cross-dresser with a split-personality just as he eventually came to be. He learned this behavior from "her". She tortured him and forced him to have sex with Maggie in order to prevent him from being as abnormal as she was. Unfortunately, she succeeded in doing just the opposite. Emma realizes that she may unwittingly do the same to her son in an attempt to keep him from being like her. This is why she sends him and Maggie away, in order to end the cycle.