Isabella (Marinette) Martha Wayne

Chapter 13

Batman had seen a lot of great warriors and fighters in his career as a vigilante.
He fought alongside many of them in the Justice League, and had fought against many others, and through all of that experience he was able to give an estimate on how skilled someone was by watching a single fight. Batman could confidently say that this heroine was on par with himself.
Batman hadn't had time to think and process it before the Watchtower delved into chaos once more and he snapped, telling everyone to be quiet and focus on the information. They would have time to talk about it all at the end but understanding everything was more important at the moment.
The Flash snickered to break the silence, making a smart-ass comment about how he must not know anything about the Paris situation compared to them considering he was being "a grump" and Batman only had to send the metahuman a glare for the hero to stop talking.
The Flash was right, he didn't have a clue what was going on and he wanted to know everything before they discussed it, but he wasn't about to tell any of them that.
After this, it showed a news broadcast in which Lady Miracle declared her new persona and revealed that Paris was free of Hawkmoth, Mayura and Shadowmoth's reign of terror.
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After the Justice League meeting winded up, it was decided that Wonder Woman would reach out to Lady Miracle to see how to proceed afterwards. All the magical users of the JL were excited and desperate to meet Lady Miracle since her magic was ancient and concerningly bottomless.

The Bats returned to the cave. Dick and Jason turned towards Bruce.
Jason- YOU SHIPPED HER OFF TO KEEP HER SAFE AND SHE HAS BEEN HELD HOSTAGE BY A TERRORIST!

Dick- YOU SAID YOU WERE KEEPING AN EYE ON HER! Bruce, we trusted you to keep Isabella safe. You sent her away, but instead of protecting her, she was thrown into a warzone. How could you let this happen?

Bruce- Richard, I thought it was for the best. I wanted to shield her from the darkness that consumes our lives. I made a grave mistake.

Jason- GRAVE MISTAKE, MY FOOT! YOU HEARD WHAT THEY SAID, PEOPLE HAVE DIED! SHE HAS DIED! BROUGHT BACK TO LIFE AND DIED AGAIN! YOU DON'T KNOW WHAT IT FEELS LIKE BUT I DO! You call yourself a protector, but you left Isabella vulnerable. She should have been under our watch, not left to FEND FOR HERSELF! And you saw the court proceedings too! YOU SAW HOW THAT SADISTIS TARGETED HER, STALKED HER, MADE HER LIFE HELL!!
DEMON-SPAWN TELL ME IF SOMEONE TORE UP YOUR SKETCHBOOK WHAT WOULD YOU DO?
Damian (calmly)- Stab them and assure them that they do not need their limbs so much.
Jason- SEE! SHE HAD HER ENTIRE WORKS SABOTAGED! SHE WAS BULLIED AND DID NOT GET AKUMATIZED ONCE! YOU KNOW WHAT THAT MEANS? SHE LOCKED HER EMOTIONS AWAY JUST LIKE WE ALL DID EVEN MORE SO!

Damian- Father, who is this Isabella?

Bruce sighed heavily- Isabella is my daughter, born out of a past relationship. I kept her hidden, thinking it would keep her safe.

Jason- We ALL saw how that turned out.

Damian- Father, I am your true son, yet you sent away this Isabella? Why?

Jason- 'cuz he is a DOUCHEBAG! I'm going out for some air.

Dick- Me too

Jason/Dick's POV
His little sister had died. She had DIED! The whole point of staying away and making sure no one could ever connect with them, was to ensure her safety. Instead she had died! She had died repeatedly, and he had been none the wiser. She had died, and HE HADN'T BEEN THERE! She had been hurt, and he hadn't protected her. She had suffered. His stomach twisted at the thought, as the bitter thoughts of self loathing threatened the pit madness again. He could already see the tinge of green creeping into his vision.

After Bruce left in a hurry, Alfred explained it all. Isabella or as Alfred liked to call her- Miss Bella was the biological daughter of Bruce. As long as she was here, she was kept within the confinements of the Wayne Manor despite everyone but Bruce's views. She was however shipped off to Paris without any forewarning when Jason died, was not allowed to attend his funeral and in their opinions, horribly treated by Bruce.