The Grey-Summers family are arguably one of the largest families in comic books. Earlier family tree articles dealt with the Greys and the Summers separately however as the majority of the content overlapped it seemed redundant not to merge them. Given the scale of this family when compiling this article, we had to create some rules to make it manageable.
- Characters had to be born on Earth 616 or have lived or are currently living on Earth 616 as "major" characters.
- Alternate reality children of characters from Earth 616 were included. So for example, Katie and Scotty are included because of their significance to Earth 616's Havok. Ruby Summers is not included because she's the alternate reality daughter of the XSE timeline's Cyclops and has never interacted with “our” Cyclops.
- One appearance and no dialogue clones were excluded for space.
- Formalized adoptive relationships were included, such as the Blandings for Havok and Jonath for Adam X but more informal relationships like Kate Pryde for Rachel Summers, Forge for Nate Grey, Ch'Vayre for Stryfe etc were excluded due to space concerns.
- We excluded alternate reality versions of characters such as Corporal Summers from X-Treme and the late characters from Shadow X due to space constraints.
- We also ignored popular fan theories such Rachel's true father being Wolverine or the Phoenix Force or Gambit being a Summers, as these theories are merely apocrypha at this point in time for the Earth-616 reality.