Yes definately. Your sister ought to know. She would be more pissed off if you didn't tell her and she found out. Think of it if the tables were turned, would you be happy with your sister knowing something as serious as your daughter drinking? Of course you wouldn't! You would feel apreciated just like your sister will if you tell her. You know what the consequences of drinking are if your niece is under age (does "un-respnsible parent" come into mind?) For the health and safety of your niece, you should definaltely tell your sister :)
yes
If you mean Hector from the Iliad, it is Cassandra who is his sister, daughter of King Priam, she is cursed to forever tell the truth but never to be believed.
Tell her that you love her as much as you can.
If your daughter-in-law and you get along well then privately sit down with her and tell her you are concerned about the way her sister hurts her. Either your daughter-in-law is able to handle it on her own or, she may need some guidance from you. Let her know that she is her own person and not a whipping post for her sister or anyone else. Then be sure you tell her to keep the conversation between you private or you could be opening a can of worms.
She should but only if they are needed.
no way
You should tell her you're sorry.
Tell your parents and let them handle it.
Tell your daughter and pray that she doesn't hate you, but gets angry at him instead.
It's up to Kate to tell people who her daughter is. We should respect her privacy.
No,You need not to tell that to your daughter but this may create problem later on.Try best to hide.
you should tell you father that you don't like the way he is drinking. But if he does not listen then you should take to your teacher or the police station. It is not like they are going to take you father to jail, they will just talk to your father and tell him to stop drinking, and start training him.