Cheaper by the Coven

Against Piper's wishes, Paige and Phoebe summon Grams for Chris' "wiccaning". In an attempt to end the budding sibling rivalry between Wyatt and Chris, Grams casts a spell on them, which backfires and turns the sisters back into bickering teenagers. This all leads to the Charmed Ones father Victor coming back to town to try to fix things. Also, Wyatt is attacked by a demon, and Leo is determined to find out who it was.