Frank Heffley is the serious, often humorless father of Greg, Rodrick, and Manny in the Diary of a Wimpy Kid series, known for his love of Civil War dioramas and his struggles to connect with his sons, whom he often tries to toughen up. He is the husband of Susan Heffley, and while he can be critical and emotionally distant, he ultimately cares for his family and has a more developed relationship with Greg in the films.