Some details altered, names faked, etc.
Backstory: I am the eldest of my dad's kids. My dad is a really great guy with a big heart, but he works himself too hard due to some insecurities he had growing up poor. My biological mother went crazy from PPD (we assume) after my sister's birth and is not in the picture (long and unrelated story). My dad has always had custody of us. My sister and I are full siblings. My dad remarried when I was 7 and my sister was 3. Then he had two kids with her, my half sister (who is now 14) and my half brother (who is now 12). Stepmom isn't a bad person, really, but she's kind of vapid. She manages some kind of marketing company tied to hair and nail salons, and my dad currently works some decent paying IT job.
When I was 13, dad lost his job. He was working for a startup which did really well at first, then not-so-well, and then went bankrupt. He had a coworker we'll call Billy, or Uncle Billy as we came to know him. Billy was a partner who lost everything in the bankruptcy. He was girlfriends with some crazy psycho bitch, and had one kid by her named Alex. When he lost all this money, the psychobitch threw him out, and sued for alimony. After a lot of court drama, the psychobitch finally decided she didn't like Alex anymore just around the time they had all kind of proven physical and mental abuse, and Uncle Billy got custody of him. Alex is now 12. From when I was 13 until 2 years ago, Uncle Billy was living with us and helping out until get won the court case, got some of his assets back, got a job, and his life in order.
Uncle Billy was the nicest guy you could imagine. Him and dad get along really well. Stepmom tolerated him, but never seemed resentful because Uncle Billy earned his keep. From the moment he moved in, he kept the house clean and in good repair. He drove us kids around for what we needed done, cooked half the meals, and generally acted as a great supporting member of the household. I certainly liked him, since he was really fun. He had all kinds of connections with amusement venues, and we'd get in for free sometimes, get a behind-the-scenes tour, and everything a kid could want. He played catch with us, arranged days at the local parks, you name it. And since dad was always working (he got two jobs right away and worked 12 hours a day for years) and tired (he also slept a lot due to some heart meds he had to take), Uncle Billy was like a father to us. When Alex was still with pychobitch, Uncle Billy got some custody with Alex, and so Alex became like a very close cousin. He's in most of our family photos, and always went on vacations with us. Alex is a good kid.
When I was 18, I moved out. There was a lot of drama there I won't go into, but I'd still call Uncle Billy from time to time to get life advice. I would still visit my childhood home a few times a month, usually for the free meals. About two years ago, as I said, Uncle Billy moved out. But he still came over on Sundays to hang out. Over the last two years, something seemed off about my sister and him. She developed into the blond surfer girl type, and was kind of embarrassingly under dressed most of the time: short shorts or men's boxers, thin half-shirts, jeweled belly button. She matured fast, and seemed to be VERY close to Uncle Billy. At first, I wrote it off as some kind of jealousy on my part, but it just bugged me. She'd lean on him, play with his hair, hold his hand... like a girlfriend. Uncle Billy didn't seem to notice, really. He was treating her like always, but he never protested the treatment, either. My sister was always a little odd; she's had a drinking problem as a teenager, and had some close calls with the police and such, but was never jailed. Uncle Billy was always there to help get her back on her feet, it seemed, and the only member of the "family" that she would listen to. Uncle Billy convinced her not to drop out of high school.
My sister graduated high school a few weeks ago, and turned 18 right after. I had always assumed that she was going to go into cosmetology, because she went to a trade school since 16, but instead she moved in with Uncle Billy. This seemed VERY odd to me. I brought this up, but dad was "well, he can afford to get her on her feet." Stepmom was "you moved out of the house after high school, why can't she?" They implied I was being sexist. Okay, sure.
Well, my sister called me from a party saying she was too drunk to drive home, and Uncle Billy was working late. So I picked her up, but she seemed really out of it. I feared someone had given her roofies, but I think that she was just really drunk. So I took her back to my place to keep an eye on her, since my roommate was out for two weeks. While she was on the couch, my sister confessed to me that she had been sleeping with Uncle Billy since she was FOURTEEN! It started when I moved out and she seduced him to get liquor. I felt sick. I reacted really badly, and I forget what all I shouted at her, but she kept insisting it was okay. He was her first, he was a gentle lover, etc etc... like, he didn't think for a second there was anything wrong with it. No self-respecting 31-year-old should ever sleep with a 14-year-old! I don't care HOW mature she was, of how she didn't think it was a big deal... god, I was so ANGRY.
So I called Stepmom, and she knew! She fucking knew! She didn't think it was a big deal either! WHAT THE FUCK??? But she told me if I told dad, it would kill him. "He wouldn't understand," she said. FUCK I DON'T UNDERSTAND!! I threatened to call the police on Uncle Billy, but Stepmom said then he'd lose custody of Alex and Alex would be sent back to psychobitch. Did I want to do that? Did I? Ruin a good thing?? Apparently she knew early on, and had been helping cover up any evidence. And I was already moved out of the house, so I was mostly oblivious. I thought she had a cruch, not SEX. Jesus Fucking Christ!!!
AAAAAUGHHH!!! I feel so sick, so betrayed, and so fucking angry! And dad has NO IDEA!!
After my sister left, I went to a dark place. I don't want to go into it, but at one point, I went to Uncle Billy's house and confronted him. That didn't go well, and he said he'd call the cops if I didn't calm down. So I just left like a fucking pussy. I wanted to beat the shit out of him, but I also didn't want to go to jail.
So I don't know what the fuck to do. I have been told if I get the police involved:
- My sister is 18, so it's legal now!
- There's no evidence of past sexytimes. My sister, Stepmom, and Uncle Billy all said they will deny it to save everyone, and I'm being unreasonable.
- My sister has said "I am the one who seduced him. It's not his fault. I don't feel violated. I am fine with everything as it is. We love each other." UGH!!
- Stepmom and Uncle Billy tried to give me some bullshit about ancient times when a woman in 14 was in her prime and given away to be married. WHAT THE FUCK, it's 2016, not 1016!!!
- If my dad found out, he'd feel betrayed, and it might kill him with his heart and everything
- Alex would probably end up going back to psychobitch.
- "What about [my half sister, who is now 14]??" Stepmom: "Oh, she's fat, and not his type." Really??? REALLY??
It's been a few days, and I am positively STEWING. I know I can't even think straight, so I stayed the hell away, and I won't do anything until I have calmed down. I spent a lot of time crying and shouting into a pillow. I must have rewritten this 10 times to keep from getting off on a tangent.
Am I being unreasonable? What would you do?
tl;dr: Should I somehow just act like nothings wrong that my sister is getting booty calls from a former pedophile roomate?