Harley reveals to Black Canary that she has a four-year-old daughter named Lucy who is being raised by her sister. After discovering she was pregnant, Harley left the Joker for almost a year to have their baby instead of abortion.
Ultimately it was revealed that Duela is the daughter of the The Jokester (Earth-3) and Three-Face (Evelyn Dent) , the Joker's heroic counterpart and archenemy of Owlman (Thomas Wayne, Jr.) This means she is Joker's daughter, just not the mainstream one.
Neytiri (also known as Princess Ladyfingers) is the daughter of Harley Quinn and Poison Ivy from a possible post-apocalyptic future. Due to Harley and Ivy going back in time and preventing the apocalypse from happening, it is unknown if Neytiri will ever exist in the new timeline.
Ok, then in the comic Injustice: God's Among Us #13, it is revealed that Harley has a 4 year old daughter named Lucy (this information is correct). Lucy is Joker and Harley's biological child.
Mad Love introduces Harley Quinn as a former psychologist named Harleen Quinzel who fell in love with the Joker during her internship at Gotham City's Arkham Asylum and details her transformation into the Joker's villainous accomplice Harley Quinn, as well as the Joker's lack of respect for Harley.
Tim Drake was the son of criminal Steven "Shifty" Drake, a thug for the crime lord Two-Face. He had very little respect for his father, and often had to fend for himself. Around the age of 10, Drake began to idolize Gotham City hero Batman and placed newspaper clippings on his wall.
"When Poison Ivy decided to change her ways and continue her plant experiments, she created Sporelings, human-plant hybrids with her unique powers. She successfully grew two Sporeling babies, Rose and Hazel, nurturing them in her apartment.
No, none of the Robins are biologically related to Joker. In comics, Joker has never been shown to have any relation to Richard Grayson, Jason Todd, Tim Drake, Stephanie Brown, Damian Wayne, Carrie Kelly, or Matthew McGinnis. However in the DCAU, Joker did kidnap Tim Drake and turn him into a Joker Jr.
Penny Fleck was the adoptive mother of Arthur Fleck, a mentally unstable failed comedian who would later call himself the Joker. Much like her son, Penny suffered from an unspecified mental illness.
Harley Quinn, real name Dr. Harleen Frances Quinzel, is a former psychiatry intern and criminal who's known for her flamboyant supervillain/anti-hero persona. She was the Joker's sidekick and on-off girlfriend, although she's since struck out on her own.
It is then revealed that the Joker's real name is "Jack Oswald White." Martha then shares that she visited the Flashpoint universe's version of Jack Oswald White, discovering him to be a struggling family man supporting his wife and a child as a janitor at Wayne Casino.
The Joker has had children show up before, but in most cases, they turned out not to be the biological offspring of the villain. Joker's Daughter ended up being the child of Harvey Dent, while his son Anarky was intended to be revealed as someone else's kid before his series was canceled.
In the pre-Crisis on Infinite Earths continuity, the maturing Dick Grayson grows weary of his role as Batman's young sidekick. He renames himself Nightwing, recalling his adventure in the Kryptonian city of Kandor, where he and Batman meet the local hero of the same name.
Later, Arthur goes to Arkham State Hospital and steals his mother's records, and finds out that he was in fact adopted, and that Thomas Wayne is not his father and that Penny is not his true mother.
Joker Jr. was born after The Joker, who had manipulated Harley Quinn into re-entering a life of crime, impregnated her without her knowing. Harley out of shame refused to accept the child and gave him up. He grew up being transferred from various orphanages and foster homes to people who never loved him.
Unsurprisingly, Batman's most popular love interest is the antihero and occasional villain Catwoman. Even though they often stand on opposite sides of the law, Batman and Catwoman still understand each other.
They conveniently broke up off-screen after the events of 2016's "Suicide Squad" movie. Harley doesn't get into specifics, but if you're familiar with their relationship, you know it's a generally a toxic one with an emotionally abusive Joker.
Neytiri is a minor antagonist in the animated series Harley Quinn. She is the future daughter of Harley Quinn and Poison Ivy. She was voiced by Zosia Mamet.
Being the first (and worst) of Harley's partners, Joker is responsible for a large amount of the trauma that she has experienced. Throughout their time together, Joker exploited Harley's love for him, thereby putting in her numerous risky situations.
