Answer: "Amauri es el primer bisnieto de mi abuela."
Step-by-step explanation:
The sentence that is NOT grammatically correct is:
"Amauri es el primero bisnieto de mi abuela."
The correct phrasing should be:
"Amauri es el primer bisnieto de mi abuela."
In this corrected sentence, "primer" agrees in gender and number with "bisnieto" to indicate that Amauri is the first male great-grandchild of the grandmother.