#bio siblings

[finemealprompt]

DP X DC Prompt #64

Cass knew she had a little brother. One not so much younger than herself. When her father sought a partner to create the ideal child to become an assassin, he hadn’t settled for just one person. 

So, yes, Cassandra’s aware she has a brother out there. Daniel, she thinks she heard he was called. If rumors are to be believed, he was just as skilled as she had been in his training. Although, not as good as herself. She never met him, though. She had just heard how one day he disappeared without a trace. 

Therefore, it’s entirely possible that the boy in front of her claiming to be her brother is who he says he is.

[batfsm]

The kids are related, biological siblings.

I'll be adding on to this a lot I hope.

Some recs:

Achieve by metukah

Just because Tim's first time at the circus was the night John and Mary Grayson died doesn't mean it was Jack and Janet's.

Common People by AmariT

His whole life, Jason’s mom had told him his dad was Bruce Wayne, but he’d never been dumb enough to actually believe it. They lived in a rundown, one-room apartment in the worst part of town, and in every single picture he’d ever seen of that rich bastard he was wearing a suit or sipping champagne worth more than everything they’d ever owned.

But if he wasn’t Bruce Wayne’s kid, then what the hell was he doing sitting outside the man’s office in Wayne Towers?

It's actually a series!

Uncommon UpBringings by Chaseha_Wing

Bruce Wayne saw his life flash before his eyes. Every plan he had put into motion for the next ten years. Every business effort, every charity gala. Heck, he'd already planned at least five dates in the next week alone that he was going to have to cancel. Everything he thought his life would be would change thanks to this baby.

And that’s not even including his plans for the night.

A story about Bruce aquiring Jason as a baby and his adventures when raising him. This can also be considered a side story of AmariT's "Common People"

[queenmolina]

wait so jack and sage are biological siblings and willex adopted them both? just for clarification! my dash is a mess and i’ve missed a few posts about next gen jatp :)))

yes :)) @futurearchaeologyprof and i discussed that they were bio siblings and willex adopted them when they were 9 and 2 years old

[batfsm]

So including MLB and DP:

Excluding them:

You think there be more without those two fandoms.... especially since Batman and his kids have been around longer (not all but most).

Top is how many fics right now include them:

Bottom is the ones that don't: