The plot thickens. But it's also off topic and NSFW.
And if you really want to know, you can only control you actions, your sister is responsible for her actions, if she is dead set on a decision there is little you can do other than show your disapproval for her actions and recommend a more suitable alternative.
Zeph do you ever tire of being perfect? ~Dave
Zeph is still awesome though. ~Rival
I love you so much right now Zeph. ~Yoshi
I love you Zeph. You and your simple yet humorous topic-breakers. ~Coos
Zeph has left me inspired. ~Mathias
Zeph is so awesome even soulless bits of binary worship him. ~Wizard
Curse YOU ZEPH! CURSE YOU! ~JesusChrist
WE ARE SORRY THAT WE ARE NOT AS PERFECT AS YOU, ZEPH! ~Stufflikehearts
Zepherin for forum queen and writer of the best seller "how to screw your brethen up for dummies". ~ The Mirak