Country artist Jennifer Nettles, Longmire‘s Gerald McRaney and NYPD Blue alum Ricky Schroder have joined the cast of NBC’s upcoming original movie Dolly Parton’s Coat Of Many Colors. Parton is exec producer.

Named after Parton’s song, the film is set in Tennessee ‘s Great Smoky Mountains in 1955. It’s described as neither a biopic nor a musical about the country star’s life and career but rather a faith-based. family-oriented story about the incidents in her and her family’s life around the time she was 9 years old.

Sugarland singer Nettles will play Parton’s mother, Avie Lee Parton; McRaney will play Grandpa Jake Owens; and Schroder is Dolly’s father, Lee Parton. They join previously announced Alyvia Lind, who will play the young Parton.

Singer-songwriter Nettles has sold more than 22 million albums as lead singer of duo Sugarland and won awards including Grammys, AMAs, ACM Awards and CMA Awards. She made her Broadway debut in February as Roxy Hart in Chicago. McRaney’s TV credits include Deadwood, Southland and House Of Cards. He co-stars on Longmire and has a co-starring role in TNT’s upcoming series Agent X. Along with three season as a regular on ABC’s NYPD Blue, Schroder’s TV credits include Strong Medicine, Scrubs, 24 and Silver Spoons. He also won a Golden Globe for the 1979 boxing film The Champ, his acting debut.

Pamela K. Long penned the film and executive produces with Parton and Sam Haskell. Magnolia Hill Entertainment and DP Productions produce in association with Warner Bros. Television.