Slightly different situation, as I'm not having a hb, but am using a midwife...
My sister (a nurse), after relaying a bunch of research to her, and she was still hesitant about me using a midwife, I basically told her to suck it.
We won't be having a homebirth, and unfortunately moved so there are no stand-alone birthing centers near us, either (which was our original plan). Due to that, we will be going to a hospital. But I am still using a midwife and I have been reassured that their practice has really enlightened the nurses at that hospital to the ways of natural birth.
As for my MIL (also a nurse...NICU), DH seems to have decided we just aren't telling her. He said if it comes up, maybe. He's just kind of said, "have our appointment..." any time he provides her with info and leaves out the words midwife or doctor lol!
I haven't run into any others, but I don't really intend to share with many until after the fact. If this weren't our first (aka...if I knew how I was going to deal lol) and home-birth midwives were accepted at the hospitals here in case of complications, I would be considering a hb. However, they don't seem to be. In our former location, my midwife had rights to practice in two near-by hospitals (one across the street from her center), even assisting in c-sections if it were to come to that. Needless to say, I was pretty sad to be moving and leaving her!