Why is it the prototype of a black mother?

According to relevant public information, the black mother in the movie "How to Be Home" really exists, and its prototype is called Rachiele. Rachiele himself is the same as the character in the film. In reality, she didn't have any identification, and finally she was arrested. Why Go Home is a tender Parisian film. In the film, Rakhil is an illegal immigrant from Ethiopia. She secretly takes her young child Jonas to work as a cleaner. Zan, the male host, ran away from home because he was dissatisfied with his parents' marrying his sister to the landlord (also his employer), and met Rakhil, a black mother, on the way to an amusement park. Zan helped Rachiele take care of the children, and Zan got the warmth of "home" for a short time here.