My parents don't know about it, though my dad knows I have some kind of blog. I had to ask him some tax questions about affiliate stuff. Though, I'm debating sort-of telling them since I don't want to stop doing reviews over the summer (and I'm at home for 3 months!)
My husband and a couple close family members know about it, but I think maybe only one of them has really read it. The others don't even know the address, and while I would tell them if I asked, it feels weird just offering it up when it is probably more than they want to know about me.