I read a book, whose title I've forgotten, in the fifth grade, which was about a girl who somehow 'went over' to the wrong side of her house and found that her parents (and brother, maybe?) had 'black button-like' eyes in the 'other house'. Her button-eyed parents and real parents coexist, but her real parents do not know of the existence of the button-eyed parents.
She somehow finds a way to speak to the button-eyed parents frequently(I think she was compelled to do so) by crossing over from her real house to the 'other house', but doesn't like them. They have an evil aura.
I'm afraid that's all I remember, and I know it's vague and sketchy, but that's the most I remember now!