User blog comment:Eobard95/Is Artemis the half-sister of Prometheus?/@comment-24152851-20170406092838/@comment-26624146-20170408114359

They said Vigilante probably won't be revealed until Season 6, just like they said "Laurel Lance will be alive and well and Flashpoint may have a little to do with it". But they didn't specify which Laurel and Flashpoint had nothing to do with it. They also said "Ronnie Raymond will kill a main character" in The Flash 2x13. But it was Earth-2 Ronnie killing Earth-2 Joe. The producrs lie all the time so the fact that they said "probably" convinced me that they mean this seaosn and not next. Also could the fact that they have different fighting styles and goals be the reason why they are the same? Look at Hunter Zolomon, he was The Flash and Zoom of Earth-2.

Maybe if Evelyn is also Claybourne's child Prometheus didn't share the relation right away just promising her revenge for his death, then Adrian reveals the relation later when he feels she's eared it?