I'm fairly sure it was never said that he did. (I'm sure someone will come and prove me wrong now. :D)

As for whether he would have... possibly later. The feeling I got was that he wasn't too keen on sharing what sort of things his father and his friends had been up to.

But that's just a guess. And while I really cannot remember him ever telling Ron or Hermione about what he knew, it's been a while since I read the relevant books, so it's possibly I just can't remember if he did.