SPN Canon Check

I need a canon check on some Supernatural continuity:

I've gotten the impression that until the time-travel events of "In The Beginning," Dean never knew what had happened between Azazel and the infant Sam. Is that correct?

However, Sam did know, but only because he saw it in a flashback/vision in "All Hell Breaks Loose" (Azazel himself never said anything to Sam about it). And Sam never told Dean what he'd seen in his vision. Yes??