Famous parents of black and mixed race children share their personal stories of making them aware of racism, and being given similar lessons by their own parents. Tinie Tempah, Emeli Sandé, Leigh-Anne Pinnock, Lennie James, Maro Itoje and Ade Adepitan are among the contributors discussing being on both sides of this commonplace exchange, and how they dealt with subjects like being seen as different or dealing with the police