Growing up, Sierra Bernal was captivated by Guinness World Records. “I would always read records and be like, ‘Oh, these are so cool,’ ” the 25-year-old aspiring singer and songwriter tells PEOPLE.

Sienna and Sierra Bernal hold two world records, but they tell PEOPLE it's kind of funny to be recognized just for existing Anna Lazarus Caplan is a writer-reporter for PEOPLE. She has been working at ...

Sienna and Sierra Bernal hold two world records, but they tell PEOPLE it's kind of funny to be recognized just for existing Growing up, Sierra Bernal was captivated by Guinness World Records. “I would ...