yes they know, kinda hard to hide the fact with my wife/sub waling around wearing her very obvious collar and "slave" wrist band, or me wearing a wristband with "master" emblazoned across it. my biological mother just says "t.m.i." (too much information) by adopted family just laughingly call my wife and i freaks while my mother-in-law (a pro-domme) only encourages us to "have fun" and even suggested the website www.bondage.com (a good site IF you pay for the "premium" membership but try and do anything as a "free member" (even post in their forum) and you get nowhere fast