11/26/2024
Sierra and her identical twin sister Sienna (Sinny) set the record for rarest type of discordant twinning and sharing the greatest height differential between living identical twins — and they're both featured in this year's special edition to celebrate the 70th anniversary of Guinness World Records. Sinny was born with primordial dwarfism, a condition that impacts fewer than 200 people worldwide. As a result, she is over one foot shorter than her identical twin.
Sienna and Sierra Bernal share two twinning world records: rarest type of discordant twinning and the biggest height differential between living identical twins.
