My husband knows completely. Though he is the type person who has never taken a drink and won't even take pain meds when prescribed, he is fully supportive of me. I would never want to think I had to hide anything from him. I thank God every day for his support. He has accompanied me to a couple doc visits when it was obvious that I needed some med help and he was appalled at the callous behavior of them when it came to prescribing. He trusts me, in that I won't throw away household money for OPs, I always make sure that the bills and necessities are taken care of, and am never "high" or irresponsible.
My mother also knows, though she has been supportive I do occassionally get the lecture about potential addiction. It is only because she does not understand, having never had any illness and having the luxury of good insurance should she need it.