Ten (10) sets of siblings or parent-child pairs
concordant for gender identity disorder (transsexualism) or gender identity
disorder and transvestitism are reported.
For concordant gender identity disorder,
there is one set of male monozygotic twins; three sets of non-twin brothers;
one brother-and-sister pair; one set of sisters; and one father and son.
With gender identity disorder and
transvestism, there is one transsexual father with a gender dysphoric;
transvestic son; one transvestic father with a gender dysphoric, transvestic
son; and one transvestic father with a transsexual daughter.
The emerging technology of genetic markers
makes collation of such families a potentially valuable resource for
unraveling the origins of atypical gender identity.
Citation:
J Am Acad Child Adolesc Psychiatry 1997 Feb;36(2):263-71 an article published
on the Internet by PubMed <http://www.ncbi.nlm.nih.gov/>
