Fenton Ethics and Test Tube Babies
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.
