Child abuse.
Enabling delusions is medical malpractice.
Render the gender - XX = female, XY = male.
Now, genetic researchers have found some serious anomalies, like extra chromosomes being attached , making an XXX, XXY, or XYY possible, but the chances of it occurring are rather low, and it is not a transmittable characteristic, as the anomalies are sterile and unable to reproduce.
Like a cross between a horse and a donkey, producing a mule, but the mule is not able to produce young, because the chromosomes do not cleave correctly to form viable zygotes.