LOT OF UNSOLVED QUESTION

What will you do when you found out your sister using her friend's mobile ( that your daddy hate the most) at night?? What will you do when you found out your sister chit-chatting until midnight 2 or 3 o clock maybe never sleep the entire day?? What will you do when you know this will influence her study?? What will you do when your sister is sms-ing or chit-chatting the whole day ( almost 24 hours ) ?? What will you do as being a sister??

Well.. I don't know.. >.<