I noticed that in (LOC, chptr. 53 The Feast of Lights, pg.926) that after everyone in the room at the time (Perrin, Dobraine, Sulin as servant, etc.) sees Rand's sword and belt that Berelain brings in, and they realize that he's been taken, Sulin wails "The Aes Sedai have taken my first-brother!"

Now I am under the impression that a first-brother/sister is either a birth brother, or someone who goes through the ceremony with the wise ones like Aviendha and Elayne did in Winter's Heart. ( Sorry, don't remember page reference for the ceremony.)

This leads me to believe one of 3 things:

1: Sulin is Rand's half-sister. I mean this by thinking that his Mother Shaiel died on Dragonmount after having Rand but his father, (can't remember name) the clan-chief guy could have had a daughter with someone else before he met Shaiel (obviously because Sulin is older than Rand.) This would be so assuming that Rand and Sulin did NOT go through with a similar ceremony as Aviendha and Elayne did, and I am assuming just that. *grin*

2: It could be that Jordan meant to say "Near-brother" instead of "First-brother" with means she just thinks of him as her brother.

or 3: I am just chasing Jak o' the Wisps and there is an explantion I missed in the books, possibly in Aviendha's explanations of Aiel ways to Rand or any of the girls, or in another Aielman's rants.

I could be wrong on this, but it caught my eye. Tell me what you think of it.