I insist in that Mary was May's sister. Just read Ultimate Spider-Man #100. There, she yells at Peter's aged clone (believing he was actually Richard), saying: "My sister married you, not me!". Furthermore, in issue #33, when peter finds his parents' belongings in the basement, she said to Peter: "All that stuff-- it belongs to you-- those boxes. It's your dad's things. My sister's things.". I'm sure there are some other examples, but i can't remember them right now.--Rcn 19:54, January 3, 2011 (UTC)

Good catch, thanks for the references! I'll correct the information. :)

— Nathan (Peteparker) (Earth-1218) (talk • contribs • email) 21:14, January 3, 2011 (UTC)

Okay, there's one flaw with your information. The last name, Parker.

If May and Mary were sisters, and married men who were not brothers, they would have different last names. Are you saying that May and Mary are sisters and Ben and Richard are brothers?

— Nathan (Peteparker) (Earth-1218) (talk • contribs • email) 21:27, January 3, 2011 (UTC)

Exactly. It's unusual, but not impossible.--Rcn 00:41, January 4, 2011 (UTC)

No offense but I insist that her real last name is Reilly, and she just felt like Mary was her real sister and referred to her as such.--Chronoman1999 01:03, May 24, 2012 (UTC)