While it is your story to tell, and on the terms you would like to tell it, the unfortunate reality is the people we tell will tell others. Once out, it becomes really difficult to control. Having come out to my wife of 12 years in late February, and now less than 60 days away from divorce, I can tell you that it sucks and you just have to be strong through it. The one thing I can tell you is that if you are worried about it, then go tell them yourself so at least you can control the messaging and what they hear and how they hear it.
My own coming out to everyone started with "Are they relevant to my transition?" If not, then I did not care what they heard or from whom. If so, then I came out pretty quickly, including to my wife's family. PM me, and I will share with you a letter I sent them, if you would like.
Be strong.
Toni