"What the hell," Dean said looking at the computer screen.

"Shh," Bobby chastised him. "Listen," he commanded, and they all turned their attention to the monitor.

"You were both toddlers. You just thought Mommy got a little fat," Patty said giving a sad smile. "You never knew I was pregnant".

"I was the only one who knew," Grams explained.

"And Sam, obviously," Patty corrected.

"Right. Well, yes, of course".

"We wanted to keep the baby, of course," their mother explained. "But mother –"

"Well, I - I knew it would be disastrous," Penny exclaimed. "You know, before you and Leo, Piper, it wasn't just forbidden. It was unthinkable for witches to be with white-lighters. I mean, let alone have children with them."

"So, that's why we had to - why we decided... to give the baby up. Sam and I took her to a local church as soon as she was born. And we asked the nun there to find a home for her, and she found one. A very, very good home."

"Explains why the Elders didn't know about her," Leo said looking at the sisters.

" All right, hold it. Wait just one minute. Are you telling me, that that girl, our innocent, is really... our sister," Phoebe asked.

Patty nodded. "Your baby sister,"she told Phoebe.

"Their baby half-sister," Grams said.

"But by my half, which makes her a sister witch. Well, actually, not yet anyway. Not until all three of you are here together by the Book. Just like before."

"Charmed. Again," their grandmother expanded.

"And I thought my family was screwed up," Cole said, earning dirty stares all over the room.

"So we know for sure that these sisters are the Charmed Ones," Sam said. "And they called Paige their innocent, obviously they're good witches," Sam said happy about his victory.

"Just because they called her an innocent doesn't make them innocent," Dean said. "We still don't know what it was that killed Prue and the doctor," he told them and shot Bobby a 'you'd better keep your mouth shut' look that threatened him in case he was going to spill the beans.

"Whatever it was must have been really powerful, Dean. From what I've learned the first born witch is always the strongest and since these are the most powerful witches of all time then Prue must have really been something special. Whatever killed her isn't going to sit around in one place long enough for us to find it and kill it."

"What do you suggest we do then," Bobby asked in a snarky tone of voice.

"Well, nothing. I'm sure the sisters will go after this thing on their own. There's no reason to hang around if we're not gonna make nice and since you and Dean are against befriending them all that's left to do is leave," Sam answered.

Dean got up from his seat and rubbed his face in his hands, sighing loudly. "We can't do that, Sam."

Sam looked surprised, clearly not expecting that response. "What do you mean, 'we can't do that'?"

"There's something else about this case that you don't exactly know about. Bobby," Dean said turning the conversation over to the oldest man to escape explaining everything.

Looking less than pleased, "Sam, it's about why you're father insisted that you boys stay out of California."

"Okay," Sam said leaning forward in his chair, a serious expression creasing his face. "What is it?"

"Well, the last time you were here do you remember anything about Dean getting into any trouble?"

"I knew he was dating a girl and Dad about killed him for leaving me alone sometimes."

"Yeah, well apparently the girl was Prue," Dean said interrupting Bobby before he had a chance to speak.

"Why didn't you say anything? Dean, this -going to the funeral; investigating-must be killing you."

"Yeah, well you don't know the half of it," Dean said.

"See, your brother doesn't exactly remember his history with Prue," Bobby said. "There was an accident and the girl was hurt pretty badly during your father's hunt. Her Grams was tracking the same son of a bitch and when she realized Prue had found out about magic the old witch cast a spell on the two of them to forget about the night's events. She wanted her granddaughters to have as normal a life as possible."

"And you and dad let her," Sam asked.

"That old witch was quick with a rhyme. We hardly had anytime to figure out what she was doing before it was over. That's why Dean's memory of that night is gone, not the hit he took to his head. She was a force of nature," he told the boys. "Used her powers to take apart our guns; we were completely defenseless. We agreed to keep you kids out of California and away from her girls. None of us knew that it was already too late," he said ominously.

"What do you mean by that?"

"While you were gone I used your computer to find Paige's birth certificate," Dean said stepping into the conversation again. "We found something, and uh, well we..."

"We found out that Dean left something for Prue to remember him by," Bobby said and then cuffed an unsuspecting Dean on the back of his head. Turning back to Sam's quizzical face, Bobby said, "He got her pregnant," at the same time as he gestured a big pregnant belly. "Your brother found a birth certificate with his name on it."

"Was it a boy or a girl? What happened to it,..." Sam rattled off a bunch of questions.

"The name on the birth certificate is Patricia Anne Winchester," Dean said.

"So she named the baby after her mother," Sam muttered. "Well, what do we do? Do we find this kid? 'Cause this is kind of really screwed up."

"We're going to do more than find her," Dean said with a determined face. "We're going to change it."

"What have you turned me into," Paige asked and ran from the attic.

"Wait," Piper said and she and Phoebe took a step to follow her but stopped as she disappeared down the stairs.