Zack Denbrough is the father of George and William Denbrough. When Georgie was killed by Pennywise, he suddenly thought that his son Bill might've not watched him like he promised. He ignored Bill until he found out that Pennywise killed Georgie. In 1982, Zack Denbrough died from stomach cancer. When his elder son got married, Zack would posthumously become the father-in-law of Audra Phillips.