Corrected entry: The past versions of Patty and Penny are amazed to learn that their daughters and granddaughters, respectively, are the Charmed Ones. However, both women knew the centuries-old prophecy that three sisters would eventually be born into the Warren line, and that they would be the Charmed Ones. It's conceivable that Patty, who came from a time before the birth of Phoebe, would not have thought of the prophecy at this time. Penny, however, came from after Phoebe was born, and previous flashback episodes had shown that Penny knew that the three sisters were the Charmed Ones immediately when the third sister was born, and was still convinced of the fact up until Penny's death [despite the birth of a fourth daughter to Patty].
Charmed (1998)
1 corrected entry in season 8
The Importance of Being Phoebe - S5-E11
Continuity mistake: When Phoebe is lying on the ground and is supposed to be unconscious, when Cole goes to pick her up you can see Phoebe throw her arms around his neck. (00:29:15)
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Correction: Yes, perhaps Penny did believe the girls would eventually become The Charmed Ones, but this wasn't confirmed to her [officially]. For all she knew, one of them would refuse their powers, die young [before their powers were restored], etc. Also, she died immediately after making a potion to strip their powers [Re-witched, Season 3]. She could have simply been expressing amazement that her beliefs were confirmed about her granddaughters' destiny. After all, she does say "I always knew The Charmed Ones would come from me...well, once removed, of course. It's one thing to believe a prophecy will come true, it's another to actually witness Future Piper confirming her belief.
jademoon
The original post is correct. Penny did know they'd be the Charmed Ones as soon as it was known that Patty was having a third child. That's the entire reason the warlock Nicholas made Patty bless the ring, and why Grams' bound their powers. It's been stated in other episodes as well. So Penny definitely knew, but in Forever Charmed she was shocked when Patty told her the girls would become the Charmed Ones.