I feel insecured about my sister.

ohh such a strong accusation to the BF. hmm.. anyway you know better than we are so maybe he is. well, it is your sister's decision so i am sure even your parents can not do anything about her status. You can just try to divert her attention to something else by being nice to her and winning her as a friend. In that manner, she will be able to divert her attention out of romance since she is just so young. but anything else.. you are helpless.

You loved your sister so you want the best for her. GOOD. the most important that you loved her. In life sometimes people just want antagonize you so she always go against your decision. Just don't be discouraged just go on with what you started in loving your sister and hope a change for the better.

She is still young and if it's her first serious relationship, it's understandable she is so depressed. But her whole life is ahead of her and she must not let a break up ruine that future. I suggest you keep talking to her and encouraging her to move on with her life. There are a lot of good guys out there and one day she will find the right one. Yes, it hurts, yes, she will go through a rough period of memories and tears, but it will all go away, I'm sure of it. And once that boy broke up it her, it's not worth the effort to go back to the same relationship, she has no guarantees he won't do that again and hurt her even more. What may distract her from the dark thoughts is a lot of joyful experiences, lots of walks, even watchong TV or reading a book may help. And definitely she needs her family and friends to be around.

keep talking to her and dont leave her alone. Tell her about her future 10 yrs down the line. Life is not only about bodily relations, it needs extra stuffs also. Make her realize all those things which she will have to tolerate if the boy does not turn up well. and keep her engaged.

I understand your concern for your sister and how do you feel. But when someone is in love, or she thinks she is, it is hard to take in any negative advices. I feel that it is better that instead of rejecting outright the relationship and her boyfriend, you may take the stand that you should be guiding her at the sideline, making sure that she is safe and while she is happily in love, she should not be neglecting her studies. You need to think from her point of view to offer your opinion. Your dislike of that boy (slum dweller!) may have blinded you to the good points that your sister may have seen in him. She is already 16, not a child anymore. She has her own views and you have to respect that. I feel that a soft and understanding approach will at least make your sister to give you the chance to provide some "advices". It is useless if you act in a big brother way.

The age of 16 is the age where all the deflection in life occurs and if one pass it, it all becomes smooth. Maybe you should discuss the matter with your parents peacefully and make your sister understand what is good and what isn't. You can also the your sister to a councillor, I think that would be more effective to sort out the problem. But don't scold your sister, it will only worsen the situation.

Hey friend, I will tell you one thing. When I was In your sister's age my teacher said "When you are in this age you will feel you are loving with some one but it is not true love it is only attraction that comes in this age so don't go in wrong ways. In this age your work is only studying and do that work best." now I feel his saying is 100% correct. Friend you understand about this thing to your sister and don't scold and don't angry with her because if you did any wrong your sister try to find that love and feel to her that she is not lonely