Without opening the whole "nature vs. nurture" can o'worms, has anyone heard of closely related males (father/son, brother/brother, etc.) both independently developing a desire to crossdress?
I was told a story that the teller swore was true (she knew the people involved personally). A single father raising a teenage son. Both crossdressing behind the other's back. Until the day the son opened the wrong drawer, and found some foundation garments that he knew were not his.
Long story short, at the time this tale was related to me, the father was still a happy and active crossdresser (officer in a Tri-Ess chapter, IIRC), and the son transitioned at an early age, and was now his daughter!
Again, purely anecdotal, and we're not establishing any scientific evidence for the genetic component of transgenderism, but has anyone heard of similar situations?