i'm a little confused about facebook here?

[*Just Me*]

My sister and i had a funny little war of words going on under her status and i know that all of HER friends can view it but can all of MY friends view it too?? when i go to my activity log and see the comments i posted under her status, the little icon to the right says "(my sister's) friends" meaning her friends can view it for sure but i'm not sure if my friends will see it too even if they are not added in my sister's list.

[Don]

If you commented on it , they can see it. it shows HER friends because SHE made the status.

[Brandon]

Yes your friend will see the posts commeted on by you and your sister if you both comment on it.

[niladri]

If they are not in your sister's friend list, they can't (if your sister has done a good enough privacy settings). There should be a setting saying, 'who can see your posts' or something like that. Tell her to change it according to your need.