I have to agree with Xinyi's post on her blog.

I understand having little brothers *shudder* are a pain in the arse, but having little sisters aren't exactly a joy ride.

Here's a list of reasons.

TOP 5 REASONS WHY LITTLE SISTERS ARE JUST STINTED, WARPED TERMAGANTS

1) Turn on the waterworks, and you are in trouble.

Description: Brat, upon seeing that you don't give in to her wiles, let loose a scream with a frequency that could shatter glass. She then goes into a conniption fit.
Effect: Obviously you get into trouble.
Feedback: I almost wished that Voldemort was real, I'll borrow that wand of his and curse her with the crutarius curse...at least she'll be screaming with a reason. Sometimes I wish I could rip her pharynx out with my bare hands, and stuff it down her oesophagus. I admit I become more murderous when she does that. *smiles angelically*
Action-reaction?: If you are sneaky or sly enough, or plain vengeful like me, you get a real opportunity to utilise all of your 'dark' tactics and terrify her.

2) "Give in..she's younger than you".

Description: Said by ignoramuses who gave birth to the spawn. She will then blow a raspberry at you.
Effect:
1) For those with soft hearts- you give in.
2)For those who can capably analyse the tactics, you refuse...and get into trouble.
Feedback: You want that Mars bar? Alright. *Offers beryllium(poison which could kill an adult with a minimal amount)* Give in...tch. Just because she's young, it does not mean that she does not have a brain. Do some research, and you'll discover that kids throw fits to get their way.
Action-reaction?: You give her all the chocolate she wants...and let her go down with cavities. *diabolical laughter* After all, some bones for my collection..or screams of anguish from the clinic would be excellent.

3) She asks you for help on Every. Single. Damn. Question.

Description: Those nitwits that are your parents demand that you fulfill your duty as an overworked, underpaid abused tutor for the brat. The brat then takes advantage of the situation, claiming that she does not know how to to all the question.
Effect: You can either...
1) Ignore her, and have her go into situations described in reason #1
2) Help her
a) Really teach her
b) Just tell her all the answers.
c)"Help" her-- and say that you were mumbling the answers to YOUR Math homework.
Feedback: I ignore her. She can't do anything, but it really annoys me if she asks for help when I'm struggling with my Chinese compositions. If I really have to help, I'll just tell her the answers.
Action-reaction?: She fails. If nitwits question, reply that she did not listen to you explaining the concepts, and wrote down the answer. Brandish your homework at the nitwits, and smilingly ask them if there was anyone who could help YOU with your work if you are helping her 24/7. Enjoy the chastising...directed at the brat.

4) She refuses to listen to you, and then blames you for any aftereffect that SHE causes.

Description: You are supposed to guide her, but she doesn't listen e.g. doesn't listen to you when you tell her not to play with fire. The kitchen goes down in flames, and you are blamed.
Effect: Obviously, you get the anger and accusation. It is followed by your explosion of temper, and your parents will ask you not to give them the attitude. Usually accompanied by elaborate murder plots and extensive blogging and sarcastic 'letters' to the persons.
Feedback: I told her to get out when I practised my flute playing, but she refused. When I could not hit a note, I lowered my flute in a hasty motion...and it twacked the shorty on the head.
Action-reaction?: Oh boy...casually drop comments that you didn't see her and was too involved in the playing. Then mention stuff about free will and it was HER decision to heed my advice and get the hell out. Then, go on about 'negligence of the peoples, even if we weren't the ones guarding the prisons' in the recent escape of Mas Selemat. The go on about other fallacies made in politics where politicians blame in on the people.
Note!: Only works if you read newspapers often. Parents must also be smart enough to grasp the link.

5) Can't think. Too angry.