Dolly Parton's sister, Stella, has claimed the late singer offered to try 'experimental drugs' during her cancer battle, if it meant helping another person in the future

Dolly Parton 's younger sister Stella, 77, is opening up about the country music queen's final days.

Dolly Parton wanted to allow her doctors to experiment in their treatments of her in order to help others down the line, sister Stella Parton says.