At sixes and sevens Book

Two sisters, who lived with the father, were quite different. Rhianon did all the work around the house and was taken for granted and blamed when anything went wrong. Serena was the pretty one who got everything she wanted and therefore expected everyone to fall in with her whims.
When Serena egged on her boyfriend and Rhianon's to fight, Serena's boyfriend was hurt badly and eventually died. Rhianon's boyfriend went to jail, but not before having a passionate moment with Serena and fathering a child. Rhianon took the child in to look after and Serena went back to her flirty ways while Pryce was in jail.
This story dragged a bit, and Rhianon, despite being described as intelligent, seemed too easily taken in by her sister. Rhianon was too good to be true, and Serena too bad. The characters didn't feel real.