Goodnight Mommy (2015)

After undergoing cosmetic facial surgery, a mother whose face is heavily bandaged, returns home to her twin boys Elias and Lukas. She exhibits very eccentric behavior and the boys question weather or not it is in fact their mother or an impostor. She only acknowledges Elias and ignores Lukas entirely as if he doesn't even exist. She keeps the blinds closed during the day and sees to it that the kids only play outside. She is very abusive towards Elias when he acts up. She murders a stray cat that the kids picked up to keep for themselves as a pet.

When the boys see a picture of their mother and another woman who looks very similar, their suspicions are confirmed and they seek help from a local priest. However, he believes the woman's claim that she is the boys mother. The boys bound her to the bed in hopes that she will finally give into the torture and admit she is really not their mother. However, there is no movement as far as that is concerned. When the Red Cross arrive, the boys give them a cash donation and then they leave. The woman screams for help but nobody hears her. She wets the bed and the boys decide now to release her so they can change the sheets. She tries to escape but the boys have a booby trap which causes her to fall and hit her head. When she wakes up, she sees Elias attempting to burn down the house. She still insists that she is their mother. She explains to Elias that Lukas died in an accident before her return and this entire time, he had only been a figment of his imagination. He challenges her to see Lukas trying to set fire to the drapes. Elias takes Lukas by the arm and sets the drapes on fire causing the woman to burn to death.

In the end, Lukas and Elias are walking through the cornfield to be with their mother and the three of them are embracing and smiling..