Manly Women and Feminine Men

After reading Creed's work I have found that a large part of the Monstrous Feminine comes from the disruption of traditional roles for women when girls become too masculine and threaten the role of manhood, especially in the house and around the family.
Heredity is a movie all about what happens when the mother figure in a family is destroyed. But it also does a lot to invert the positions of man and woman. The typical roles women and men play in horror movies are as follows: the woman is either the last one alive or she becomes the prize the man gets for his survival. Her motivations often are either about the man or the same as the man. Often times she is the reason for the spooky to be happening.
 In The Creature From The Black Lagoon Kay isn't shown to care about anything but whether or not she and the men around her survive. She has nothing to motivate herself, she also works as the point of conflict with all of the men (creature included) fighting to keep her on their side. David then wins her after the creature is defeated.
In Heredity, though Annies goals clash directly with both Peter and Steve's. Steve wants to take care of his son and help him to work through his emotions, something traditionally feminine. Annie wants to keep her family from finding out she has been going to group therapy and later she wants to take on the threat that is attacking her family. Therapy in this movie serves as a symbol of coping and healing something Annie is starchly against (in a hyper-masculine world like the one we are in this also gives Annie a more masculine presence).  She also never wanted to be a mother, at least not the first time she was pregnant and then had the child she actually wanted taken away by the one she didn't. Losing Charlie did the opposite of castration to Annie, it gave her her masculinity. So Annie is phallic and Steve is not. In the traditional horror film this places Steve as a prize for Annie to win should she take down the threat to her home. Peter has no real motivations outside of trying to follow Annie at first but being too scared to go through with her plans.
He starts off as a regular teenager who has a crush on a girl and wants to smoke pot, but after he kills Charlie he loses all sense of personality, his only real job left is to cry and freak out when the spooky start to happen. Again this is usually a woman's job.

Peter ends up being the last one left alive, the Final Girl Boy if you will.
He ends up dying at the end but coming back possessed by his sister.
Thus the threat of the woman is fulfilled.
 The family is destroyed and all that is left is a Feminine Man.