Oh, I see. Don't worry, many of us (myself included!) have been there. With our addiction, it's never really in the past...if we forget to nourish ourselves, we may find ourselves right back where we initially were. I hope this doesn't sound insensitive, but you need to worry more about YOU and less about what your family thinks. I completely understand the secrecy- right now i am keeping a secret from my sponsor and not being honest. I will have to deal with that, and i will.
Anyhow, you could just tell your family that you are going because you need the support. You don't just go to AA/NA when you're actively using- you go because the fellowship strengthens you and upholds you in your resolve to live a new life. Perhaps they will understand that. Best of luck to you! Please keep posting.