Karyn was Richard's dream girl because she came from a middle-class family and life (meaning that she wasn't high maintenance ... unlike his ex-wife, who was), but she was just as beautiful and sexy as Susan.
Sarah groaned, hearing her dad and her step-mom giggling with each other. It just made her sick, knowing that Karyn was now her mom. Well, she may have been married to her dad, but Sarah would always consider her mom to be Susan, her dad's ex.
If only there was a way she could get rid of Karyn and get her dad to remarry her mom.