Original: He and wife, Caroll Angell, are the parents of television screenwriter Tom Whedon and the grandparents of Film and TV screenwriter and director Joseph "Joss" Whedon and screenwriters Jed Whedon and Zack Whedon.
Simplified: He is the father of screenwriter Tom Whedon and the grandfather of screenwriter and director Joss Whedon and screenwriter Zack Whedon.