In "When We First Met", we spotlight the various characters, phrases, objects or events that eventually became notable parts of comic lore, like the first time someone said, "Avengers Assemble!" or the first appearance of Batman's giant penny or the first appearance of Alfred Pennyworth or the first time Spider-Man's face was shown half-Spidey/half-Peter. Stuff like that.

Today, based on a discussion in a recent edition of From a Different Point of View (where I have been discussing the Avengers, issue by issue, with Eileen Gonzalez), I look into when Scarlet Witch and Quicksilver were first established as twins. Reader Rob H. wrote in with his pick for the answer and I believe that he is correct.

Scarlet Witch and Quicksilver debuted in the fourth issue of the X-Men by Jack Kirby, Stan Lee and Paul Reinman...

As you can see, from the start, all they say is that they are siblings...

Even when they kind of sort of reveal their origin, there is nothing besides them being siblings...

In Avengers #16 (by Jack Kirby, Stan Lee and Dick Ayers), the two siblings decide to join the Avengers. Note that Scarlet Witch specifically notes that Quicksilver is her OLDER brother...

So that was the set-up until Giant-Size Avengers #1 in 1974 (by Roy Thomas, Rich Buckler and Dan Adkins), where we learn that they ARE twins because they were born on the same day (Quicksilver might have been born first, so maybe he can technically claim to be the older sibling. Sneaky, Quicksilver)...

And they have been the wonder twins ever since, even as their origin has gone through a MULTITUDE of retcons in the years since (as their parentage has changed repeatedly).

If anyone else has a comic book first that they would like to know, drop me a line at brianc@cbr.com!