In season 5 in the episode "The Day the Magic Died", Piper gave birth to their first son, Wyatt. In season 6 in the episode "It's Bad, Bad, Bad World Part 2" she gave birth to their second son Chris. In the series/ season 8 finale, "Forever Charmed" when Piper is taking her turn to write in the Book of Shadows, it shows her with her two sons as well as a daughter, that is assumed to be Melinda, the daughter she saw she would have in season 2 in the episode "Mortality Bites".
So Piper and Leo had two sons and theoretically one daughter that really only exists in a future beyond the show.
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Forever Charmed, the series finale
I do not know the name of the episode but I am pretty sure there is at least one episode were Leo tickles Piper.
2 times first in magic hour the elders Then in harried
He only tells Phoebe and Paige. Phoebe and Paige tell it to Piper. Leo finds out from Phoebe.
season 2 disc 1 or 2