Vanner Johnson’s wife, Donna, had purchased the take-home genetic testing kit 23andMe for fun. But when her husband received his family’s 23andMe results in August 2019, he noticed something odd. His 11-year-old son, Tim, wasn’t listed as his biological relative. The couple soon learned that the hospital where Donna had undergone in vitro fertilization (IVF) 12 years earlier had likely mixed up the sperm samples. Vanner wasn’t Tim’s biological dad.