Carlos was a city boy through and through. He loved nice clothes, and he had loved his mother, who had died a few years earlier.
If Wilber was his twin, then the woman who raised him was not his mother. The brother he grew up with was not his brother. The news devastated him.
When Carlos finally faced Wilber, he searched for any difference between them. He couldn't find one. Both cared about how they looked, both had their eyebrows waxed, and both called themselves crybabies, because they had been so sensitive as children.