Probably they saw the signs by the time you were 3 years old. They have spent years wondering when you would finally just be yourself. About "understanding", there are plenty of scientists, medical doctors and psychologists whom don't really understand. Not everybody has the brainpower to understand, and even PhDs often need an educational upgrade before they can understand.
Acceptance is more important than understanding: both, by you accepting yourself, and you being accepted by others. Understanding can come later, or never, and it's still OK.
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They said they were surprised that I said that I want to be female. They told me they always thought I would be a "Daisy Girl."