<human>: Could you distill the essence of the text into 1-3 sentences?

On the one hand, I feel obligated as her brother, when I see her (seemingly) being lead astray, to step in and talk to her about it and possibly talk to the guy as well and figure out what his intentions are (or to recommend he change his ways).

On the other hand, I feel like it might make her angry and hurt our brother/sister relationship for stepping in where she thinks it isn't needed.

What do you think? If you were in a relationship where, from the outside, it appeared to be a bad relationship (but you may not realize, or care)... would you be upset if your brother talked to you about it?

The guy lost his licence and his job by getting a DUI while **working** (he was a drive-to-broken-down-cars-on-the-highway-mechanic). He is constantly posting on Facebook about how awesome the drugs he took last night were, how drunk he was, etc. Mind you I'm OK with marijuana and drinking, but this guy doesn't appear to moderate it in any way. Shortly after losing his job, he moved in with my sister. He then also invited one of his friends to live with them.

I can't help but feel like my sister is being taken advantage of. She's basically dating our dad, which is a very scary thing. He's clearly taking advantage of her in terms of living situation & money. He's probably also getting her involved with a not-so-great crowd with his drug and drinking habits.

The worst part is that she's gorgeous, and really smart. Between me, my other sister and her, she had **by far** the most potential. Super intelligent, hard working, really pretty, I love her to death and she deserves the world... not the lowlife she appears to be dating.
<bot>: My little sister is dating a deadbeat. Would it be appropriate for me as her older brother to step in and talk to the guy / her?