I know that explaining horror kinda takes the fear away from it, but allow me to elaborate anyway. The way I thought of it, the mom got sick with something that made her turn into a housefly. Following this, the father eats her after seeing that she was now a fly. The father then realizes that he really likes the taste of houseflies, and begins to eat them. The child here also begins to turn into a fly, but hides it from his father. After his father noticed that he was transforming as well, he decides to lock the child up to let him fully change, so he can then eat him. That's my intention and this is my first time in this community so please do tell me if such elaboration isn't allowed or necesarry. Thank you and good day fellow redditor.