I've told everyone in my family, but did not have to tell my mom or dad as they both passed away long before my hrt.
I often think about it, though, and I know with conviction that they would be supportive, and loving. My mother was a very strong woman, from a very diverse family, and she, above so many others would understand, and want me to be the best woman I could be. I think she probably always had more than an inkling.
Bev