Answered: Father Daugher sexual relationship movie - not porn

Could someone please help me with the name of the movie.

I just remember the plot of this movie.

Father and daughter are in a relationship. They scheme to kill the mother who is shown to be killed subsequently in an accident. The father returns from the hospital and breaks the news to the daughter and then they have sex right there on the kitchen counter.
Now, daughter is a bit brazen about the relationship and the father is afraid that people will find out. He freaks out when he finds that the daughter has been telling 'secrets' to her friend but she reassures him that nothing of the relationship has leaked.
Father gets depressed.
Daughter comes to father at night and he is a bit drunk and takes him to the upper floor by a staircase lift (open lift) and then ties a noose around his neck and sends the lift back down - thus killing him.
Daughter is killed ( can't remember how)
In the last scene the mother returns and is smiling. She had known of this all and had plotted the thing playing on the weakness of the father daughter.