As evidenced by these identical twins:
“As children Robert and William Haddock would regularly be pictured together with their matching outfits and identical smiles.
But today that picture is very different.
The boys may have grown up as identical twins but Robert always knew he was in the wrong body.
At the age of 18 he made the brave decision to change his name to Mary and she has not looked back since.”
“A woman has revealed she still considers herself to be an identical twin after her sister transitioned from a woman to a man.”