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Even though Nenny and Esperanza don't look like sisters the way Rachel and Lucy do, the narrator says that they have a lot in common. Like the way they laugh.
The narrator gives an example of this – one day the four girls pass a house that reminds Esperanza of Mexico, and she says so. Rachel and Lucy don't get it, but Nenny is totally on the same wavelength, and says, "That's what I was thinking exactly" (7.4).