Identical twins separated in infancy and raised apart from each other happens quite often in Toobworld, and that's in established plot lines. (Off the top of my head, I can think of one specific case covered in two episodes of 'The X-Files'. And then there's always two movie versions of 'The Parent Trap'.)
So of course, I've embraced the concept to splain away certain characters who look exactly alike (because in the Real World, they were played by the same actor).
Until proven otherwise in the next few weeks as 'The Book Of Daniel' runs its course, it will be my contention that the young computer genius known only as "Yoda" is the twin brother of Wilson from an episode of 'Curb Your Enthusiasm'. Wilson was the young boy whom Larry David met in the hospital and who blackmailed Larry into making it possible for him to finally see a pair of boobs. (I'm not sure if "Wilson" was his real name, or if he took his name from a movie character as well - as in Wilson of "Castaway".)
In the Real World you hear about the similarities between twins who were raised apart, and this would be the same situation in Toobworld. "Yoda" also had a fixation on girls' breasts and wanted to see Grace Webster's heavenly body in exchange for his computer tech expertise.
And if that theory should fall through (Let's say, the parents of "Yoda" claim he was an only child), then the two boys could always be identical cousins.
I think we've seen that happen before in TV Land......