Baryan_KuramaSeal
When Batman learns he has another son, Damian, from the mother being Talia al Ghul, daughter of one of his most dreaded enemies, Ra's al Ghul, Y/n is at first unhappy with the matter to finding out his not only has a half brother but is related to a family of killer assassins, though he can't really speak on the matter considering who his own mother is.
Things quickly turn against Batman, Robin (Y/n), and Damian, as Batman must become both father and mentor to the aggressive, agile new son of his as Y/n has to come to terms with this new family dynamic. Together they form an uneasy alliance to try and thwart the criminal enterprise of Deathstroke and his army of Man-Bats before there are international consequences.