Wicked - Nancy Holder

Holly Cathers's world shatters when her parents are killed in a terrible accident. Wrenched from her home in San Francisco, she is sent to Seattle to live with her relatives, Aunt Marie-Claire and her twin cousins, Amanda and Nicole.
In her new home, Holly's sorrow and grief soon give way to bewilderment at the strange incidents going on around her. Such as how any wish she whispers to her cat seems to come true. Or the way a friend is injured after a freak attack from a vicious falcon. And there's the undeniable, magnetic attraction to a boy Holly barely knows.
Holly, Amanda, and Nicole are about to be launced into a dark legacy of witches, secrets, and alliances, where ancient magics yield dangerous results. The girls will assume their roles in an intergenerational feud beyond their wildest imaginations...and in doing so, will attempt to fulfill their shared destiny.