Just a FYI, my sister met a person on the internet.
At the time she lived here in Regina and he lived in Oregon. After a period of about 2-3 years of never having really met in person and only speaking with each other via net ways a very interesting thing happened.
SHE MARRIED THE PERSON. (edit :that was over 8 years ago :0) )
I would have to say in regards to you trying to control whom your sister is interested in, that is a very bad idea (unless there is direct abuse going on). Let me tell you why based on personal experience.
Let's take my wife for example. We have been married since April 6, 1996. From the moment we got betrothed to each other, her mom and dad have done their best to try to paint a picture of me based on what they think from their worries and fears. Yet time has a very funny way of showing truth over error.
After 15 years of it her parents are looking truly truly foolish as their prognostications of the certain failure of our marriage have not only failed to materialized but have been proven so very wrong.
I would think you would not want to stick your feet into your mouth with some of the stuff you might say to your sister in your efforts to prove her 16 year old heart wrong.
Love if it is indeed love has a power that is far greater than you or anyone else possesses.
It is one thing for you to offer her advice, it is quite another for you to think it your mission to show her the foolishness of her ways. There is a sad thing about people having and ulterior motive trying to prove the validity of their point of view and forcing it on another.
I wonder will you show her this post as well?
Chef