On December 22, 2008, Chapman married Cassie Piersol. The couple began a project called A Hymn a Week in 2010 to honor the musical heritage left to Chapman by his parents. Chapman has stated that both his parents, who were small-town pastors for their entire lives, had a strong influence in his life and they "implanted the hymns into heart". Chapman's mother Mary died on December 26, 2002. His father Terry died on April 12, 2009, after a lengthy battle with Parkinson's disease and multiple myeloma. During his last years, he lived with Chapman and Cassie. During that time, Chapman played and sang old hymns at his father's bedside. Being asked to perform a hymn at a friend's funeral inspired him to begin compiling a brief history and personal connection to a different hymn each week, on a webpage called A Hymn a Week.