Winnie Mandela raises her fist during the funeral for 17 people who were killed during fierce rioting on Wed. March 5, 1986 in Johannesburg's Alexandra township. AP hide caption

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AP

JOHANNESBURG, South Africa —Winnie Madikizela-Mandela is one of the most revered —and controversial — women in South African history, but to her grandchildren the anti-apartheid icon was always just their beloved 'Big Mommy.'

Now two of Mandela's granddaughters are reexamining her divisive legacy in a new Netflix documentary series called The Trials of Winnie Mandela , currently only available in Africa.

In the trailer for the series, sisters Princess Swati Dlamini-Mandela and Princess Zaziwe Mandela-Manaway acknowledge they have set themselves a hard task, asking "How do you ask your grandmother, are you a murderer, are you a kidnapper?'"

But they think they managed to present an unbiased portrayal of Winnie in the series.

"I'm so proud of this work, because it is not just a myopic view of a person that we…