Season 4 brings big changes in the lives of the Halliwell sisters. As they face the loss of a sister, season 4 brings the arrival of Paige Matthews - half sister to the Halliwells. As Piper and Phoebe cope with the death of their sister, they learn to accept Paige and teach her the ways of witchcraft all while perfecting the use of their own growing powers. They focus on destroying The Source once and for all. Phoebe and Cole go through
