Reiss Sanders and his stepdad Stephen Sanders-Hall holding their Mensa certificates with Rebecca Sanders Hall. See SWNS story SWTPmensa. A kind stepdad volunteered to take an IQ test alongside his brainy 10-year-old stepson to calm his nerves - and they BOTH qualified for membership of Mensa. Reiss Sanders suffered a last-minute bout of nerves before the Cattell III B test so stepdad Stephen offered to take it as well. And to their surprise, they both scored enough to join Mensa, with Reiss scoring 100% - officially making him a genius. Football-mad Reiss, who took the famed IQ test in his Arsenal football kit, and stepdad Stephen, took the Cattell III B test - around 300 questions - at their closest centre from where they live in the village of Upchurch, Kent.