Simplify the following text for a Grade 7 native English-speaking person.
Original: Zack is from a family of writers : he is the son of screenwriter Tom Whedon , grandson of screenwriter John Whedon , and the brother of screenwriter\/musician Jed Whedon and producer\/director\/writer Joss Whedon .
Simplified: He is the son of writer Tom Whedon and the brother of writer-producer-director Joss Whedon .