I don’t know what to do

Janet

A couple of weeks ago my little brother told me that he didn’t feel comfortable around my little sister’s boyfriend and I kind of got that feeling whenever he’d come over. But he told me why and I was so shocked and angry. My parents are very strict so when my sister wants to see her boyfriend he has be in the living room downstairs with my sister. They can’t go in her room. Every once in a while she tells me and my brother to check up on them and for the past couple of months I’ve been working every night, so my brother would have to check up on them. So apparently there have been multiple occasions where he would see my sister’s boyfriend eating her out. My brother is 12 years old. I think that’s so fucked up to let your boyfriend eat your ass on the couch in a very public room where your little brother has walked in on you. To top that, they tell my brother that if they buy him stuff then he can’t tell my parents. So they buy him food all the time. He still doesn’t feel comfortable when they are together. I’ve never told them that I know. And today I don’t need to. Today we went out to buy stuff for our trip to Mexico and the entire day I didn’t talk or even look at him. And then him and my sister went to the basement to watch a movie. The door to my room and the laundry room are right next to each other and are both in the living room. I was constantly going up and down the stairs cause I kept on forgetting to get something upstairs. While I was up there my mom reminded me to wash my clothes so I went downstairs. And guess what?? I saw my LITTLE SISTER with BOTH of her underwear and pants down standing right in front of him and when they saw me their face turned white and she pulled up her pants and I told him to leave and went inside the laundry room. I opened the door again and they were just sitting there and I told him I was fucking serious and that he should get the fuck out before I beat his ass. So he got up and left and made some bullshit excuse to my parents. My sister also got up and went into her room. I was surprised I was calm and I’m glad I was cause if I went on full attack mode then my parents would hear and find out and my dad would beat the living shit out of both of them.

UPDATE:

I was giving my sister attitude and my parents asked me why. They also asked why I didn’t like her boyfriend and pretended like he didn’t exist. And all I said was that they should ask them. And they asked why if I can just tell them right there and then. So I told them that it’s not secret, it’s theirs. At night my mom went into my sister’s room to ask what was going on. And I guess she sugar coated what happened. Before she went to school this morning my dad asked her why I was so upset and she told her that it was because I actually wanted to keep the insurance check that I got from this one accident. And that she told me that dad was paying for the insurance and that’s why he was getting it. Which is not true, her boyfriend said that and was talking shit about me while she just sat there doing nothing. So before I went to work this morning he asked me what happened. He knew what she was saying was complete bull. He kept pressing me about it so I craved in. I sent my mom and my sister a text message warning them. And my mom blew up my phone and I didn’t answer cause I was running late. I did see that she texted me saying that I have to resolve this issue. When I got home my mom didn’t even look at me and pretended I wasn’t even there. She was acting normal towards my dad and my sister went to the kitchen to get food and my mom acted normal and caring towards her. I don’t get why she is acting so nice to my sister but is giving me the cold shoulder.