Undoubtedly among the most sinister actions of Jessica Jones' nemesis Zebediah Killgrave (also known as the Purple Man) is his habit of fathering and abandoning a string of children who share his powers. In the comic series Devil's Reign: Omega Jessica Jones took it upon herself to right these wrongs by seemingly giving one of his sons a home and a chance for a new life. Unfortunately, a prediction from Galactus in The History of the Marvel Universe suggests the boy's future is unavoidably tragic.
As the name suggests, the Purple Children were the offspring of the Purple Man with different women spanning several years. Canonically there are five Purple Children that were introduced in Daredevil (Vol. 4) #8. Over the years, Killgrave kept tabs on his children until they had matured enough to unlock their mind-control powers to use for his insidious plans of worldwide political domination. He was temporarily successful until his children's combined abilities overpowered him. Unfortunately, they recently got caught up in Wilson Fisk's war on superhumans, leaving them at the mercy of the government.
In Devil's Reign: Omega #1's 'Fall and Rise' - from Chip Zdarsky, Rafael de Latorre, Clayton Cowles, and Federico Blee - Jessica Jones and her daughter Danielle find Joe locked in an orphanage with a power inhibitor collar. Jessica is enraged and rips off the collar, telling Joe that he deserves his freedom. Joe enacts revenge on the caretaker by telling her to "take a walk." Although she has rejected being a superhero, Jessica discourages this use of his powers and reveals how villainous Joe's powers can be if he acts like his father. Jessica subsequently brings Joe home, seemingly offering him a place with her and Luke Cage. It's an amazingly empathetic choice, helping the child of her abuser heal from the villain's machinations. Unfortunately, The History of the Marvel Universe #6 (from Mark Waid, Mike O'sullivan, and Javier Rodriguez) suggest Joe may already be doomed, as a future version of Galactus mentions "the tragic fate of Luke Cage and Jessica Jones' second child" among a range of predictions which have since come true (not including Tony Stark and Emma Frost's wedding.)
The heartbreak from Joe's potential is twofold. In their first appearance in 2014's Daredevil #8 (from Mark Waid and Chris Samnee) Joe and his Purple Children siblings seek murderous revenge on their father by any means necessary. However, Joe also appears to want to rewrite their father's legacy by learning how to accept genuine kindness rather than forcing people to bend to him and his siblings' wills. At that moment, readers see the man Joe could become: a potential leader using his powers for good, despite the trauma of his origins. Killgrave's son being destined for something terrible despite his desire for growth in a loving home is one final way for the Purple Man's legacy to continue to hurt others, not through his evil, but through his son's potential for good.
Although fans haven't seen this particular prediction come to fruition just yet, nearly all of Galactus' visions have come to pass, which doesn't bode well. Jessica still isn't free of Killgrave's influence even now - currently fearing he has placed a psychic bomb in her mind over in The Variants - so to see her take such a positive step that's destined for tragedy is heartbreaking. Joe is so young to have suffered so much, but it seems he will either live to become the next Zebediah Killgrave or else suffer a terrible fate as an innocent. Hopefully, Jessica Jones can find some way to cheat Galactus' prophecy and give the Purple Man's son a chance to forge his own destiny.