Damian Wayne

Damian Hafid al Ghul Wayne (b. December 29th, 2008) is the son of Bruce Wayne and Talia al Ghul, the stepson of Tony Stark and half-sibling of his children with Bruce, and the grandson of Ra's al Ghul.
Years before his conception, when Bruce was training under Ra's in Nepal, he was offered to be the successor of Ra's as leader of the League of Assassins. This included Bruce eventually marrying Talia, who was still un-presented at the time. Bruce turned down this offer and fled Nepal, both because he hated Ra's' stance on murder and the prospect of having a child bride. Bruce then did go on to marry Tony Stark, who was not much older than him, but the circumstances of their coming together were much different and with Tony's informed consent versus otherwise.
In 2003, over a decade after this, Talia approached Bruce, offering him again to become the successor of Ra's and to become his second spouse. When Bruce denied her as well, she told him that she and her father would always get what they want. Talia and Ra's then devised a plan for his next successor to be the child of her and Bruce. When Bruce was looking for Tony after he had been kidnapped in Afghanistan, he was given false information to go to a bar in Iran. Talia subsequently drugged and raped him there, which led to her conceiving Damian. Bruce did try to rescue Damian from the League of Assassins through a plot to kidnap Talia the summer of 2008, but ultimately failed.
On December 29th, 2008, six days after the birth of his legal half-sister/paternal step-sister, Kamala Stark, Damian was born. Not much else is known about him at this time.