Sister's girlfriend?

[Equinox1]

Okay, my sister and I are basically the same age except I'm three months older (not biologically related, we're fifteen turning sixteen this year). She recently got a girlfriend and I was initially happy for her but now I'm concerned. First, they've never met in real life. They met online and did something bordering on cybering via a forum we all use and now my sister claims that they're girlfriends. They are still talking but have only known each other for like two days. The person claims to be a girl and the same age as us. I'm willing to trust them on that but a bigger problem is...well, I accidentally found some of this person's messages on a thread where she talked about her IRL boyfriend and I don't think that my sister knows about him. Now, I've thought about it and I don't want to intervene and be a stereotypical "protective big brother", I want her to have freedom and have privacy with her girlfriend but I don't know. I'll have to tell her about the boyfriend, won't I? Should I introduce myself to her online girlfriend (I can PM her) or just stay out of it?

[Croconaw]

This is a difficult one. I say you should definitely get involved because it sounds like you are concerned. Your sister could end up thanking you in the long run.

[Tesserax]

The best way to deal with it is to directly address the source of the problem; the girlfriend. PM her, let her know that you know. Tell her that she has to do something about this, or you will have to tell. Give her a couple of days, and then tell your sister if she hasn't said anything yet.

The longer this goes on the worse the problem will be, you'll have to deal with it. And who cares about stereotypes, the important thing is to do what's right.

[Cadanance00]

Be a protective big brother. It's your duty. With all the creeps online trolling for girls there's absolutely no way to tell what's going on.

You should say, "Sis, I think there's something you should see."

How do you think she's going to feel when she finds out herself and finds out you didn't tell her?

[ClaraWho]

How is this even a question? You point it out and comfort her. Unless you hate your sister? o.O

~ Clara

N.B. Tell her to video call her too to verify not a creeper.

[Zachary G]

Yeah, Im with everyone else on this, call the girl on it and give her the option of coming clean to your sister or you will do it.