Emily and Jason

Emily and Jason spend every day together. Although both of them would have rather gone home with friends after school, they had no choice but to walk together. Emily could not stand the fact that Jason acted like such a know it all. He was only one year older than she was but he acted like he knew everything. Of course, he never hesitated to tell on her every night at dinner either. Yesterday he complained because she did not clean the sink in the bathroom; last week, he rated her out for not putting away the laundry. Emily could not wait for next year when she would be able to have the house to herself.

What evidence does the author use that allows the reader to infer Jason and Emily's relationship?