Why is "Mi abuelo es chilena" incorrect?

Answer 1

The sentence "Mi abuelo es chilena" is incorrect because the word "abuelo" is masculine, and therefore the corresponding adjective or noun should also be in the masculine form. The correct sentence would be "Mi abuelo es chileno," which means "My grandfather is Chilean." If you were referring to a grandmother, you would say "Mi abuela es chilena," since "abuela" is feminine and takes the feminine form of the adjective.