Bill Denbrough and Zack Denbrough

Bill Denbrough and his father, Zack Denbrough, share a relationship that is defined by a catastrophic emotional rupture following the murder of Bill's younger brother, George. Before George's death, Zack is described as a tough but fair parent. In the aftermath, however, he becomes a distant, almost ghostly figure in Bill's life, a change that profoundly shapes Bill's character and his solitary quest for vengeance against the entity that killed his brother.

The Fracture of Grief

Zack Denbrough's grief manifests as a cold withdrawal from his surviving son. Bill observes that his father now makes only "fatherly gestures" and goes through "fatherly motions," but they are hollow. The emotional warmth of their home is gone; Bill feels a "big chill" emanating from his parents, who sit at opposite ends of the couch like "bookends," with Bill himself feeling like a book that no longer fits between them. This emotional abandonment is starkly illustrated when Bill tries to tell a joke to break the silence. His father responds absently without looking up from his magazine, and his mother asks, "Did you say something, dear?" as if he were barely present. The coldness is so profound that Bill feels it is not just from his parents but from the ghost of George himself, a "killer from the white wastes." This rejection drives Bill to seek solace and purpose elsewhere, forging the bonds with his friends that will lead them to confront It.

A Father's Practical Legacy

Despite the emotional chasm, Zack provides Bill with one crucial piece of information that becomes a key to the Losers' Club's mission. In a rare moment of conversation in his workshop, Zack explains the complex and poorly mapped sewer and drainage system under Derry. He tells Bill that the main sewers are large enough for a person to navigate, that the system is a labyrinth of crisscrossing pipes, and that the blueprints for much of it have been lost. He warns Bill, "you never want to go into one of those pipes, not in a game, not on a dare, not for any reason," because people have gotten lost and died. This warning, born of a father's concern, ironically gives Bill the very knowledge he needs to pursue the monster that lives in those tunnels. Bill later uses this information to convince his friends that the creature's lair is in the sewers, a critical step in their plan.

A Son's Unheard Plea

Bill's desperate need for his father's love and recognition is most poignantly captured in his secret fantasy. He obsessively repeats a tongue-twister his mother taught him: "He thrusts his fists against the posts and still insists he sees the ghosts." He believes that if he can one day say this phrase to his mother without stuttering, the coldness will break and she will hug him. This fantasy is a direct response to the emotional void left by both parents, but it is Zack's silence that is most crushing. When Bill finds his father crying in George's room, he wants to comfort him but does not dare. Zack tells him to "buzz off," reinforcing the message that Bill is alone in his grief. This profound loneliness and the need to fill the void left by his father's emotional absence are a primary motivation for Bill's leadership of the Losers' Club and his determination to kill the monster that took his brother.