One of the quirks (that has since arguably become a trope) of X-Men canon is the tumultuous relationship so many of them have with members of their own family. Scott Summers has an intergalactic space pirate for a father and two mutant brothers he’s had to do battle with as frequently as he’s worked with them (not to mention the matter of his many time-displaced or alternate reality children). Wolverine (who slew his own biological father without even knowing who he truly was) has a vengeful half-brother named Dog Logan and a relationship with his son Daken that can only be described as “fraught.” Even Nightcrawler’s “father” is the frequent X-Men villain Mystique (having been conceived by the mutant Destiny and Mystique while shapeshifting into a male form).
Considering the sheer number of team members who have had openly hostile relationships with their family, it’s a wonder that the extremely powerful telepath Jean Grey came from a relatively “normal” background. Despite her parents not knowing their child initially was a mutant or what the Xavier Institute truly was, Jean maintained a relatively normal relationship with her family up until the Dark Phoenix Saga of the 1980s. Marvel has long-since retconned her into having multiple siblings, but initially Jean only had one: Sara Grey, who appears alongside her founding X-Man sister in Spider-Man: Brand New Day, albeit in a much different fashion.
