it all depends, I didn't learn about my H's A until it was over for a few months and he was back w/me. Had he been doing that I doubt I would've told my family, I always held hope he'd come back to me, they didnt' even know he had left our home and the kids and I.
What is there to gain? can you give us a quick synopsis of your sitch? maybe then some people here on your same shoes can recommend something.
Would it be harder for your S to continue the A if others know? would it make such a difference?
Be not afraid...I will repay you for the years the locusts have eaten Joel2
30something 2kids survivor of S, MLC, A, D I have peace in my heart, at last.