Robert is 15 years old and does not identify with his biological sex. although there is some controversy about the classification, the current dsm-iv would categorize robert as having:

The current DSM-IV would categorize Robert into the category of Gender Identity Disorder. There are two main identification points of the same: the opinion that a person is of other sex, and a persistent and strong gross-gender identification. The person is usually not comfortable with her own gender and behaves opposite. 

You love them i guess