Curate, connect, and discover
When Selina was pregnant with her's and Bruce's child, she was thinking of settling down and raising the child. But when she had given birth to the boy, someone had broken into the hospital and stolen not only her baby but also other babies had been taken from the hospital. She tried to find out who took her baby boy but couldn't find the perpetrator.
Heartbroken at the loss of her baby, Selina masks her grief with being Catwoman. She doesn't tell Bruce about their baby boy, even after the new boy that goes under the Bats wing. She does treat each new Robin as if they were her own son. She talks to Harley about what had happened when Damian comes into the fold, where she then reveals that she had a baby with Bruce to the man and what happened to their baby after a few sessions with Harley.
Danny is on the run from Amity, from the Fentons, from the GIW, and from Vlad. The Fentons found out about him being Phantom and attacked him. They then teamed up with the GIW to hunt him down. He doesn't want to go to Vlad, as the Fruitloop is slowly becoming more and more crazy to get him to become his son and slowly focusing less and less on Maddie.
He heads to Gotham, as the city spirit, when she was chosen to be part of his court because of her knowledge and power, had told him that he was one of hers, a child born in Gotham to a woman that wasn't Maddie, Catwoman, and that's also how he found out that he's the son of Batman as well, because Lady Gotham gave him that answer as well, but she didn't tell him their real names. He just hopes that his mom and dad will be happy to learn that their son is still (mostly) alive and on his way to them.
And then Danny is caught by the Joker. He couldn't put up that much of a fight as he used up a lot of Ectoplasm escaping the lab he was in. Tucker's family moved away during middle school, and so did Sam's family when the start of high school came, Jazz had returned from college to help him escape the lab he was held in, but had to go back if she wanted to keep the scholarship.
The Batfam was having a family day out in Gotham. Bruce and Selina were engaged and wanted to bond as a family. Then Joker began broadcasting across Gotham.
"Hello Gotham! Today, I have a special guest with me"
The camera panned to a boy tied up in a chair, head hanging low.
"Brucie Boy seems to have forgotten to mention that he has another brat to call his own, so I took it upon myself to inform you all about him!"
When Joker grabbed the face of the boy and showed it to the camera, the entire Batfam tensed. Because the boys face had the features of both Bruce and Selina, the cuts, bruises, and blood on the boys face couldn't hide that fact, and now they need to find the boy to save him from what Joker has planned for their son.