I don't recommend outing him to his family. It will backfire in ways you wouldn't expect. They will believe what they want to believe, regardless of how much evidence is to the contrary.
Just think about the r'ship you want your D to have with these people and only do things that will not jeapordise the future of that relationship. You have control over that aspect, you don't have control over what they or h do RE their relationship with your d.
Hope that doesn't sound too harsh. Just a Purple outside looking in with perhaps a little more objectivity.
** Purple
As soon as you trust yourself you will know how to live. Goethe
