Some people tell everyone and lay it all out - I did.
Others say nothing and confine their sharing to places like this or face to face supports like NA/AA.
Either way can work - it's a personal decision.
My family was always one not to talk about their problems, so although I just came right out with it and told them I was an alcoholic...they thought I was 'too emotional and overreacting'.
Even without that support, I found good support here, others find good support with face to face groups.
I hope your family will give you more - my family is spectacularly dysfunctional
My advice is to read around here a little more, get other peoples experiences...if you decide to tell them...I'd be as honest and open as possible....'just the facts ma'am' stuff.
D