Bruce didn't know you existed for a good while, mainly because you aren't from Gotham. You're a child he had from a fling when he was in Star City for a Gala that Oliver hosted, but after a new vigilante joined the Teen Titans, he got suspicious at the similarities between you two.

Bruce beings Bruce, investigated, ending up using some dna from a cup to do a test, and as expected, you are his kid. He went to Star City to talk to your mother. When you return from school, you see your mom standing with Bruce in the apartments living room, Bruce looks over at you as you entered.

"Kid. Sit, we need to talk."

Bruce spoke, adjusting his suit jacket, your mom silent beside him, looking off.