Task: Question Answering
Input (English): Passage: 18-year-old Joy starts her catalogue of bad choices by running away from home with Tom. They marry and have a son, Johnny. When Tom, a thief who mentally and physically abuses Joy, is jailed for four years after attempting a big robbery, she is left on her own with their son.
After briefly sharing a room with her Aunt Emm, an aging prostitute, she moves in with Dave, one of Tom's former associates. Dave is tender and understanding in his treatment of Johnny and Joy, but the idyll is punctured when Dave gets 12 years for robbery. Intending to be faithful, Joy writes to him constantly, moves back with Aunt Emm, and initiates divorce proceedings against Tom. She takes a job as a barmaid, starts modelling for a seedy photographers' club and drifts into promiscuity.
But when Tom is released, Joy agrees to go back to him for Johnny's sake. One evening, after Tom has beaten her up, she runs out of their flat and returns to discover that Johnny is missing. After a frantic search, she finds him on a demolition site. Realising how much Johnny means to her, she accepts the need of compromise and stays with Tom, but she continues to dream of a distant future with Dave. 
Question: What is the name of the person that Joy is left on her own with?
Output (English): Johnny.