nothing. you don't get anything special at all. so it's not worth not killing your sister.

r u sure?

Quote:

i dout that any1 didnt kill there sister but if u dont wut happens beside a **** lode of good points

In Fable: The Lost Chapters you can go on a special sidequest if you don't kill her. I don't know many details since in my game I killed her (I read this on gamefaqs). It starts with a cutscene after you destroy the Sword of Aeons. In the cutscene a character (the Guildmaster I think) tells you that a special sword has been discovered at the Guild of Heros. After the scene ends you'll be in Oakvale. Head to the Guild of Heros and talk to the character from the cutscene to continue the quest. You'll see another cutscene and then you'll have to go to the area where there are four graves surrounding the staue. Examine the one which says, "This grave awaits a Hero worthy of the legends lying here." If you have enough good points you get a sword named Avo's Tear.

Here's a link to the site where I read this.
http://www.gamefaqs.com/console/xbo...ame/929075.html
It's in the "Expanded Content Guide".

Quote: familyguy

i dout that any1 didnt kill there sister but if u dont wut happens beside a **** lode of good points

absolutely NOTHING happens.if ur playing t.l.c, you can get avos tear, instead of the sword of aeons by reading the book in the left bookcase in mazes tower, and reaDING THE INSCription on the empty grave outside the guild. hope that helps. oh, and you will NEVER see her again. Ever.

Quote: familyguy

i dout that any1 didnt kill there sister but if u dont wut happens beside a **** lode of good points

TURE. NOTHING DAME DIFFERENT BESIDES THE GOOD POINTS. I KILLED HER BECAUSE I JUST FELT LIKE IT. SHE KINDDA BUGS ME. BUT I REALLY DON'T KNOW WHY I DID IT. MAYBE FOR FUN.........