In order to get the funding they need for their Ghost stuff, Jack and Maddie Fenton had to do some... rather illegal things when they left college.
One of them was testing alien DNA and seeing if it was compatible with human DNA.
However getting their hands on Superman's DNA or any of the main Leaguers would be far to hard for two up coming scientists and would run the risk of them being caught. Instead they set their sights on some of the younger aliens.
Such as Starfire, or rather Koriand'r.
They manage to get their hands on her DNA, and also her boyfriend (Nightwing) at the time and began to test it. They felt unsure with what they're doing but they needed the funding and in order to make themself feel better with what they're doing they decided if they were test her DNA with someone she was seeing it would be... better for their own conscience (it doesn't make what they're doing okay but they think so)
Eventually they succeeded in the testing! A baby can be made between a human and a alien.
HOWEVER because we know how the Fenton's get, they kind of go ahead of what they were only meant to do, which was just to TEST the compatibility of the DNA. Basically the paper's before the test phase.
With them getting tunnel vision on this project... They create said baby.
Then before they could show off that creating a new baby via test tubes actually works, they were told that the paperwork they were working on were going to be given to a new team, thank you for your work, here is the money for your ghost stuff, and have a good day.
The people who hired them then just leave.... Without knowing about the newly made baby.
Jack and Maddie name the baby Jasmine.
A few years later when little Jazz asks for a sibling... Well they bring out the old test tubes and papers.
And even though Starfire is no longer dating Nightwing, her new partner Red Hood would make a wonderful male donor for their future kid.
Sometimes a family is you, your best friend, a guy you threatened once, the butch cop who arrested you a few weeks ago, an anti-social scientist you didn't know was living in your basement until recently, a random 19th-Century professor you picked up while time-traveling, and your female counterpart from another universe with whom you share a complicated romantic history.
I swear there was a ask asking me to draw a bonding moment between Shoko and Megumi. I can't for the life of me find it. Wtf. Anyway, have fun with a little snippet
Those Constantine is Danny's dad and sold his kid soul because he thought he'd actually never have one and Danny is now the Ghost King so his soul claims are invalid AUs but learns he's not Constantine only kid (after a while Constantine honestly 100% thought he'd never have kids and never bothered with a 1st born clause when making deals, maybe some annoyed deity or powerful magic user made Constantine think he can't have kids anymore just to get back at the conman) and now doing everything in his Kingly power to save his half-siblings (can be other teens from other shows or movies or cartoons etc etc) because Danny is the oldest of them and really really wants to punch his biodad for making such a huge mess he has to deal with but Danny does get to meet and protect his younger Half-siblings.
Then comes the day he's celebrating one of his half-sibs birthday with all the others when he's suddenly summoned out of the blue and meets not just the Justice League but his, and his half-sibs, no good soul selling biodad.
Hello rightly placed aggression.... Once he takes care of that powerful evil spirit that's attacking earth first of course.