Okay, I have this little thing, and I need to know what you guys think.
First of all, I'm 16. My brother has 2 kids, and a wife. A little background on them: they were high school sweethearts, when they were seniors she slept with another man from her work on New Years Eve. In general, she doesn't have a good reputation and my mom never liked her background or really her family's background (they drink a lot, fight, that sort of thing). Anyway, after she cheated on him they broke up, and my mom told him she didn't approve of her, etc, so I guess as sort of a plan to get to stay together, he got her pregnant. So, she had her first child her first year in college, they're now both 24.
This weekend, he is gone at a basketball tournament. So, last night she wanted to go out drinking, so she asked me to babysit. I said sure, and I watched their kids until 3 am! Anyway, she gets home, she's drunk, and there's this guy with her. He's a real douche bag, and he's from a town about 45 minutes away, Farmersville (which is where she grew up, and her parents/brother still live). But this guy, he's a friend of her brother's, and her brother is outside in the car waiting to give me a ride home! So I hear the guy say "hey, so did you want me to stay the night?" she says yeah, then she goes outside to talk to her brother and I hear "you're so stupid, you idiot" screaming, her brother is yelling at her, she's not really saying anything.
So... I live just down the street, and the brother is on his way home and he's got 2 friends in his car. So, he gives me a ride home (he hasn't been drinking, his 2 friends have, so have my brother's wife and the guy that's at the house).
So, I go home. Her brother and 2 of his friends go back to Famersville, but this one guy stays the night. So, this morning, me, being the caniving person I am, I go back up to her house because I left my cell phone charger there, and what do I see when I walk in? He's lying on the floor, she's on the couch about 3 feet away from the floor. He's asleep, she's awake, so I walk in, say hi, tell her I'm getting my cell phone charger, and leave.
Now where I need your help: would you assume she's having an affair with this guy? I mean, she acted a little weird last night and this morning when I was there... she's not really even friends with this guy, he's just her brother's friend (and, apparently, he is sick in some way because earlier in the week she took him to the doctor). But, why would she have him spend the night if they weren't having an affair? Why not her brother, or NO ONE? Why does she need anyone?
I just want to know, what should I do? Just not tell anyone aobut this? Go to my mom? Go to my brother? My brother's wife? Find out more information before I say anything? Or say something to just my mom and let her find out more???