Strangers Posing As Family

When Jon entered the kitchen, he stopped suddenly and stared. There was a woman crouching near the floor, picking up pieces of the dish that she had supposedly dropped. The woman was dressed just like his mom (he remembered that shirt - she wore it only a few weeks ago). But this woman wasn't his mother. He didn't know *who* she was. "You broke *another* one?" a voice asked. Jon turned around and saw a person walking into the kitchen. The person was dressed just like his Goth sister Zoe. But this person wasn't Zoe. What the hell was going on? Who *were* these people? And why were they dressed as his mom and sister?