Miles is the son of Donald De Souza. Although he is the only son of a millionaire, Miles has not always been close to his father. Likeable and able, he struggles with feelings of worthlessness which only feed on his personal issues, including alcoholism and depression. When Nicola Blackstock (now Nicola De Souza) returned to Emmerdale she told people that her husband was dead. It was eventually discovered by journalist Jasmine Thomas that her husband Donald was in fact alive and on a life support machine.