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I have heard that the brain is actually formed differently than a males at birth. If a "female" is female genetalia-wise, but her brain is formed like a males, then "she" might actually have that urge to BECOME male. I don't have a source to back that up, but I remember hearing about it.
I, personally, have no questions about this thread. I have watched many Discovery Health programmes about MtF and FtM transsexuals. In fact, I remember watching one programme about two siblings, a girl and boy, who BOTH switched genders. :]
Edit: I have just one question, actually, specific to this case: How did your sister tell your parents? And were they supportive?
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