How do I, as a straight parent, help my teen through a gender identity crisis?

Asked by Strauss (23635) January 26th, 2016 from iPhone

Edit
Due to an unrelated and very minor crisis, I was unable to completely edit this Q until just now.

Our 16-year-old originally came out as bi when she was in 8th grade, during a speech to the student body. We were supportive of her then as we are now. Yesterday, while waiting for an after-school activity, she called my wife and told her she feels more male than female, and wants to be addressed by the male counterpart of the birth name. The tone of the call was that of crisis. S/he wanted to know how to tell other (possibly more conservative) close relatives without alienating them or being the subject of alienation. Her mother and I are there with her, and will provide whatever support we can. I have never experienced a crisis of identity, gender or otherwise, and feel this is the one area of life where I am lacking experience. I would appreciate any input and suggestions anyone can help me with.