In the movie Son of Batman, Damian Wayne is revealed to be the son of Batman and Talia al Ghul, the daughter of Ra's al Ghul, and the grandson of the infamous villain Ra's al Ghul who leads the League of Assassins. Damian has been raised by the League and taught their dangerous ways, causing him to be extremely violent and out of control.
After Ra's al Ghul's death, Batman discovers Damian's existence and goes to rescue him from the League's clutches. However, Damian is reluctant to leave his home and sees Batman as a weak father figure. Meanwhile, Deathstroke is hired to take out the League and causes chaos in Gotham City.
Throughout the movie, Batman must come to terms with being a father and work to gain Damian's trust while also stopping Deathstroke's destructive plans. Damian struggles with choosing between his loyalty to the League and his desire for a normal family life with his father. Eventually, the two must team up to take down Deathstroke and both learn valuable lessons about family, trust, and the dangers of revenge.