It is really a great story so far. What you need to do next is to write what did Ryker and Noelle do when they heard the footsteps above them. Did they investigate or did they leave the house? Since Ryker had already told Noelle that his brother was going to try and murder her, I don't think you should send them directly upstairs to see what or who made the footsteps. You should let the story continue a little more to be more dramatic. Don't let the story be a cliche like others would do. Perhaps, they could hide and wait to see who comes down. They could also catch the brother and then call the police or even the parents. You want the story to be different and have more excite to make the reader be wowed in the end.
Differences in strength, hormones, body structure, bone structure. Like when you draw a man figure, the body is usually a rectangle but when you draw a female, the body is an upside down triangle. Hormones like estrogen, only women have. Similarities are intelligence, appearance. Women and Men are treated differently, especially in the work place, because they used to be seen as lower class and we are thought of not being able to do some of the obs that men do, like manual labor because women don't have the same muscle mass or upper body strength as men do but men are also seen as not being able to do some jobs that women do, especially in households, because they don't have motherly instincts or they can't cook as well as women can.
Fahrenheit 451(I read this and its awesome)
Frankenstein
Ender's Game
The Martain (Don't watch the movie first!)
I hope this helps;)
