Both of my parents found my stash when I was younger so they know, but they never said anything after having a concerned discussion and throwing my stash out in the years to come so I think they just thought it was "just a phase." My brother may have also known since he was still at home. By technicality, anyone who has seen my posts here and on one other site also knows. Other than that, I don't think anyone else knows as I've never told anyone.