Helen Dwyer grew up in a middle-class family in the suburbs of Perth. It was only when she was 14 that she discovered she was not their biological daughter.

Raised by a non-Indigenous foster family, Dwyer, also known as Ellen Collard, found herself in limbo.

New film The Grey Line tells the story of her upbringing and also of the pain and intergenerational trauma in other Stolen Generation families.

Dwyer has long wanted her story to be told and acknowledged so others can have a greater understanding of the pain the Stolen Generations have been through.

"There is a sub-section of the Stolen Generations who have never been acknowledged," she said.

"Those of us who were raised by white families and totally disconnected from our Aboriginal family, our culture, our language.

"We're not white, not black, we sit on this very lonely grey line."

When director Scott Quayle first heard Dwyer's story he felt the connection between them was instantaneous.

"I think we had a really good connection when we first met it was almost instantaneous," he said.

"A lot of Australians don't understand that this didn't happen that long ago, so we saw it as a real opportunity to educate people in that space and broaden people's education around these stories."

Dwyer daughter and a producer on the film, Kayah Wills, said although there are elements of pain which come along with the film, it's important for it to be seen.

"Our children need to hear these stories, so they can grow up and share what they have been taught, and to learn what our people have endured just a short time ago, in what most would assume was generations ago," she said.

"It was a journey to get to this point and it was never something I thought would actually happen. This film will open up the dialogue amongst Indigenous and non-Indigenous people. It will help to demonstrate why people are still angry, or sad or feel unheard.

"It will help those with no idea this was something that happened in Australia, or those that have heard about Stolen Generations, but do not know what that actually meant for families to endure."

The Grey Line will premiere February 19 at Palace Cinemas in Raine Square Boorloo (Perth) in an already sold-out screening.

The film will also be screened at Luna Cinemas on March 5. More screenings will be show at The Backlot throughout March.