Gah, I'd entirely missed seeing the first line of your post above (until it was quoted in the email notification I only just read today).
I do apologize about the shocking sentence!
I was so focused on the nuances of the twin part, I'd forgotten about the first clause, which I now realize makes him sound like a pedophile out of context.
But then, the actual reason he was interested in her (eugenics) wasn't really all that benign either.