Evil Within

"A happy woman makes a happy home" Gerald's wife was opposite of this quote. Her in-laws treat her like dirt even when she goes the extra mile to make them happy. She was on the edge of loosing her temper when she finally got pregnant. Her mother in-law now treats her like her own daughter; but why does her sister and brother in-laws still treat her like dirt?
Find the answer to this question. Hatred without a cause!