Probably. GET HER IN TROUBLE! Just kidding. She's 15 years old, she's old enough to date and even make out. Well, it depends if the parents approve of this boyfriend or not. Don't tell your parents unless you think they are going to do more than that. Let her live her life, but also be there for her and make sure she doesn't do anything she will regret later on.
Well, if you know that she has a boyfriend that's great. But never let your parents know. Let your sister tell them. Talk with your sister and convince her to tell your parents.
Tell the sister that her boyfriend is disrespecting you. She should settle it. Tell the boyfriend that you do not appreciate him disrespecting you. Other than that, there is really nothing you can do.
If you can forgive your sister, you can forgive your boyfriend. It doesn't necessarily mean that you should stay with your boyfriend. Cheating is cheating and if that is not acceptable to you, you should find someone who will respect that wish.
If you know you boyfriend has feelings for your sister you should leave him! How could you live with the fact that the man you love is thinking about your sister in a way he never should. I hope you have a nice family who can support you and agree that nothing should ever happen with your boyfriend and sister, if it does...i'm sorry.
I Think Think you should keep her away from your Boyfriend than because i had a sister like that before
Let it go. If she doesn't figure it out in a few months, tell her parents.
If you think your sister is at risk or in danger you should tell your parents and not cover for her. If it's something un-harmful you should
You are not related to your boyfriend's sister, although you and she may be friends. If you were to marry your boyfriend, she would be your sister-in-law.
No, as long as he is good and not cheating on your sister or anything
Tell him to pick which one he wants to be with.
NO its not ok to date your sister ex boyfriend that nasty to date your sister ex boyfriend i would never date my sister ex boyfriend and i hope she wont date my ex boyfriend
If He Kissed Your Sister Then The Only Thing To Do Is Catch Him In The Act Then Dump Him On National TV.