Jennifer Nettles, Gerald McRaney and Ricky Schroder have joined the cast of the upcoming TV movie Dolly Parton's Coat of Many Colors, NBC announced.

The small-screen drama is based on the inspiring, true story of country music icon Dolly Parton's remarkable upbringing.

"This once-in-a-lifetime movie special takes place inside the tight-knit Parton family as they struggle to overcome devastating tragedy and discover the healing power of love, faith, and a raggedy patchwork coat that helped make Parton who she is today," a news release said. "The film is set in the Tennessee Great Smokey Mountains in 1955. It is neither a biopic nor musical about Dolly's whole life and performing career, but rather a family-oriented, faith-based story about the incidents in her and her family's life around the time she was nine years old."

Nettles will play Parton's mother, Avie Lee Parton; Schroder will portray her father, Lee Parton; and McRaney will play Grandpa Jake Owens. Newcomer Alyvia Lind will play Dolly Parton as a child.