Answer: Ask her why she is being annoying and ask her to stop. Whatever you do, don't flip because your sister might not be too pleased with you and neither will her best friend if that is the case.
I don't have one ,but my friend has a really annoying little sister ,and trust me she is ANNOYING!!!!!!!
Parents never tell my little sister/brother and her mates off when they are annoying me because parents either feel embarrased to shout at your little sister/brother in front of her friend or that they feel guilty telling off your little sister/brother's friend, what you have to do is tell your parents what your little sister and her friend did and hopefully they will tell your little sister/brother off for doing so, that's what happens when my little sister annoys me
Tell your friend that you like her
it depends on how shes annoying you
On your little annoying sister's birthday.
If you still like your best friend then try to get her back or let her go with your sister if that's what your friend wants. Or mabey your friend could be friends with your sister and best friends with you.
You can play with them
a brat
Hahahaha I believe all younger siblings can be annoying at some points, but they will always love you.
Just don't talk to her cause I have a little sister
Because either brothers friends are in love with little sister, or hate little sister because brother does.
My little sister