Darren Monroe was known in his line of work to be hard as stone, set in his ways, and always running and old-fashioned, right ship. He planned out every detail of his life from the moment he was raised, as that's what he had to do. But when his devoted, loving wife became pregnant with twins, it ruined all the plans he had for the next several years of his life. He planned to have 1 son, his heir, and 1 daughter, his princess.
He knew logically he'd probably have more than two kids in his lifetime, but not right now. So when Sara said she was pregnant with twins, he was furious. He wanted her to get rid of the extra, but she refused, making him even angrier.
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Isolabella was born the unwanted twin. Her mother loved her, giving her the "beauty" part of her given name, but her father despised her, and he always wanted her know. Not just by naming her "alone", but by making sure she felt as much that way as he could.
Mia, the "wanted" twin, couldn't help but love to bask in Daddy's extra love and attention, and eventually grew to rub it in Isola's face. The pair, Daddy and daughter, loved to torture Isola to the breaking point, until she learns how to fight back.