Season 6 episode 18 "Spin City"
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The Legend of Sleepy Halliwell after going on a spirit quest & seeing that Wyatt will have a brother & she's pregnant
When Chris tells them Leo and Piper have to conceive him before his birthday or he won't exist.
He only tells Phoebe and Paige. Phoebe and Paige tell it to Piper. Leo finds out from Phoebe.
Piper finds out in 6x16 and Leo in 6x18
It's 'The Legend of Sleepy Halliwell'.