Skin

Skin is a 2008 biographical drama film directed by Anthony Fabian. It is based on the book When She Was White: The True Story of a Family Divided by Race by Judith Stone, and the life of Sandra Laing, a South African woman born to white parents, who was classified as "Coloured" during the apartheid era, presumably due to a genetic case of atavism.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.