Based on “Grant Morrison';;s Batman & Son”, ';;Son of Batman';; told that Bruce Wayne discovered he had a son (Damian Wayne) with Talia Al Ghul and he was brought up at a small group of assassins named League of Shadows. After Ra';;s Al Ghul killed Deathstroke, occupied the company and went watch the mother and daughter, Talia took Damian to live with Bruce to ensure the safety.  .