My mom knows very clearly what I do. She knows I go on TeamSpeak, plays League of Legends, and use Skype with people from all over the world. My little sister has seen me doing video chats over Skype, and even karaoke as of a few days ago. (don't ask..)
Just yesterday, my mom took me shopping and told me to get some "gaming snacks". She knows how much I play, that I forum, and I've even told her that I recently hit 4k posts and placed within the MCGamer Awards (Or rather, I jumped around the house in excitement. XD)
Sometimes we used to have 4-hour long drives almost every week, and often they were late at night. In order to keep her awake while driving, she asked us (her kids) to talk about various stuff, so I talked about Minecraft most of the times. I've mentioned drama on MCSG, Dave, Col, HalfSquirrel, RC, and a ton of other people. She also knew and was relatively supportive of me when I was involved with clans, and sometimes made exceptions for me when I had clan battles. (Although I never asked her to, because I don't want to inconvenience her, but eventually she noticed that I was upset because I couldn't battle on Saturdays like pretty much everyone else because of church, and finally let me stay home once in a while)