Washington State Twin Registry

11/24/2025

"I know we're now 80, but if you don't keep moving, and you don't eat well and exercise, your body's not going to work."

The sisters, who have taught for decades, say age is not a barrier to sport.

11/17/2025

As identical twins, the Luster sisters show how impossible it is to isolate a single cause driving cancer in young adults, and how devastating it can be for patients at a crucial life stage. Brinlee's diagnosis changed the trajectory of her life as she navigated surgeries, bills, and fertility treatments to preserve her hopes of having a family. Mariela tried to stay on track with her own plans, starting a career, and later moving to a new city with her husband, while quietly shouldering survivor's guilt.

One twin got colon cancer at 21. The other didn't. Their story illustrates the mysterious nature of the rise of colon cancer in young adults.

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.

10/31/2024

Happy Halloween! 🎃🎃

Did you and your twin coordinate costumes this year? Share your photo in the comments!