Warning! Spoilers for X-Corp #3 below!
Although he's a fan favorite, the X-Men's Jamie Madrox aka Multiple Man appears doomed to be a bad father and he just got even worse. When his first chance for a family ended traumatically, Madrox got a second chance with his wife Layla Miller and son Davey. But his obligations to science and his new employer X-Corp have been monopolizing his time and judgement to the point where he foolishly sends a duplicate or "dupe" of himself to witness an important moment in his child's life but loses the memory forever when the dupe dies, caused by an accident of his own doing!
Created by Len Wein, Chris Claremont, and John Buscema for Giant-Size Fantastic Four #4 (1975), James Madrox has the mutant ability of kinetic duplication, meaning he can create identical physical copies of himself triggered by physical contact. While looking exactly the same, Madrox's duplicates reflect similar or completely different aspects of his personality and all of their memories become Jamie's once they are reabsorbed into his body. After the Fantastic Four introduced him to the X-Men, Madrox would fight alongside the famous mutant superheroes, and is primarily known for his membership with X-Factor, whom he would later go on to lead. While his relationships have always seemed to fail one way or another, he eventually finds a genuine connection with Layla Miller, retiring from X-Factor to settle down and raise a family together. After an unfortunate stint of death, Madrox returned to the X-Men and was later asked by Warren Worthington and his former X-Factor teammate Monet St. Croix to join X-Corp.
In X-Corp #3 by Tini Howard and Valentine De Landro, Dr. Madrox and his dupes are hard at work preparing for X-Corp's big upcoming launch to the point where Jamie's work begins to overshadow his obligation to his family. When Layla interrupts his work to let him know his son is almost ready to take his first steps, Jamie's attempt to juggle both important events leaves him alone surrounded by dupes of himself. When a sympathetic duplicate offers to help, Madrox sends him in his place to see his son's first steps, with the promise that he'll be absorbed the moment he returns back to the lab so that Jamie can experience the memories.
Artist Valentine De Landro's work on X-Corp #3 evokes his time spent on Peter David's X-Factor, the series that saw Madrox going through a personal crisis when teammate Theresa Cassidy aka Siryn announced she was pregnant after a one-night stand with Madrox. Unsure if she slept with him or one of his dupes, Jamie and X-Factor welcomed his son Sean only for the celebration to become the stuff of nightmares when Jamie absorbed his own son, the child's father being a duplicate. The moment traumatized X-Factor, especially Theresa and Jamie, so one would think he'd take it more seriously when presented with a second chance for a loving family. But Madrox fails to prioritize his family over his work, acting more like the Fantastic Four's Reed Richards but with a real chance of getting away with the deception.
While his duplicate is away, Madrox learns of a crucial flaw in his research and the ongoing experiment that threatens to be very dangerous. He implores any nearby dupe to help fix the problem, the only one available being the recently returned family man, who dies fixing Jamie's mistake. When Madrox realizes which duplicate died, he tries to hide it as a regrettable loss of data when it's actually a symbol of his own failures as a father, with these cherished memories now lost forever. In the end when the X-Corp's big launch fails, Multiple Man is beside himself, an X-Man who tried to have his cake and eat it too, but only ends up hungry, empty handed and with only himself to blame.