Looking for fics were...

[deftonsita.livejournal.com]

Rodney has a twin?? Any pairing is good, but John/Rodveney have extra points :D
And is ok if the twin is not actually even alive, (maybe he or she died when they were young)

Comments

[athenaswind.livejournal.com]

The only two that I know of both have Grant Jansky from Traders as Rodney's twin. Both are dark and come with various warnings (Tzigane has put the warnings on the main page: http://www.caffiends.net/index.php) Though I honestly skipped through most of the torture/squick-worthy bits on the first story.

Basura by Kat Reitz & tzigane
http://sga-flashfic.livejournal.com/391898.html

His Brother's Keeper by Tzigane and Zaganthi
& Twice Over by Perryvic and Zaganthi
http://www.caffiends.net/viewstory.php?sid=477



There's also story with Grant as Rodney's cousin, where they get mistaken for twins:

Voyage par Mer By Sealie
http://www.trickster.org/storybook/sealie/Voyage%20par%20Mer.htm

[athenaswind.livejournal.com]

Whoops... The link for Twice over is here:
http://www.caffiends.net/browse.php?type=characters&charid=114

[janineo.livejournal.com]

There's a series where Jeannie is Rodney's twin sister. Crossover with Doctor Who, set before 'McKay & Mrs Millar'

http://www.fanfiction.net/s/2434550/1/Box_Of_Surprises by LE McMurray