A patient-parents whole exome sequencing identified a homozygous state for <i>ATP7B</i> mutations causing WD in the proband (p.Gln7fs/p.His1069Gln) and her mother (p.His1069Gln/p.His1069Gln), who was then confirmed to have cirrhotic WD. The gene discussed is ATP7B; the disease is Wilson disease.