Christopher Diaz is the son of Eddie Diaz and Shannon Diaz. He moves with his father to Los Angeles after he is discharged from the United States Army. 

Christopher Diaz is played by Gavin McHugh. 

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9-1-1 Quotes

Maddie: I guess I just want my little girl to have a normal family. You know, uncles and grandparents that she might actually know.
Buck: Well then maybe you shoulda got knocked up by a guy who has one of those.

Eddie: You're a badass under pressure, brother.
Buck: Me?
Eddie: Hell yeah. You can have my back any day.
Buck: Yeah. Or, you know, you could have mine.
Eddie: Deal.