Three. Wyatt, Chris, and a girl is their third child. We don't know her name, but we can assume with some surety that her name is Prudence, since that is what Piper was going to name Wyatt until she found out that her first born was a boy.
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Forever Charmed, the series finale
Yes, they have three kids, Wyatt, Chris, and Melinda.
I do not know the name of the episode but I am pretty sure there is at least one episode were Leo tickles Piper.
Leo and Piper get married in the third season and I think that its on the fourth disc. The episode's name is "Just Harried."
He only tells Phoebe and Paige. Phoebe and Paige tell it to Piper. Leo finds out from Phoebe.