I'm close to my family, but have only told my wife. I figure this is a really personal path I'm on (54 days sober) and am focusing on myself. They've made some comments here and there like, "Drinking vitamins today are you?" when I had virgin caesars, or "What, are you crazy?" when I turned down a beer for a pop, but nobody has outright asked me if I've quit drinking yet.
I found this helpful because I was under enough pressure as it was, without knowing everybody was watching my every move. But hey, that's me, and your family situation might be very different.
Murray