Identical location of accessory pathways in family members with Wolff-Parkinson-White syndrome, although theoretically possible, has never been described. A 37-year-old woman and her 18-year-old son were referred for electrophysiological study due to fast rate palpitations and pre-excitation on baseline electrocardiogram. After mapping during pre-excitation, successful radiofrequency application was located at the right free wall in both patients, in an identical anatomical position, on the infero-lateral aspect of the tricuspid ring.