The phrase "mi abuelo es chilena" is incorrect because "abuelo" is a masculine noun in Spanish, meaning "grandfather." Therefore, the adjective "chilena" (which is feminine) does not agree in gender with "abuelo."
The correct phrase should be "mi abuelo es chileno," using the masculine form "chileno" to match the gender of "abuelo." If you were referring to a grandmother, you would say "mi abuela es chilena," as "abuela" is feminine.
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