Answer:
The woman assumes that the narrator’s brother is native to the region, but he is actually an American.
Explanation:
She is trying to speak to him in spanish because she thinks he is a local, because he doesn´t look white, and she assumes that he is native, the interesting and ironic thing is that the woman doens´t even have in mind that America is a multicultural, immigrant-made nation from all colors and origins and the guy she was asking for the picture was actually american just like her.