<human>: Can you provide a brief rundown of the text in within 3 sentences?

So to start off, my mom and dad divorced back in 2009. My dad died in 2013 but that's not the point. Anyways, my mom started dating this guy in 2011. We'll call him J [30-something/M].

First of all, I've never been fond of J. My dad didn't like J so I, being close to my dad, didn't like him either. Still haven't in the 5 years I've known him. J has two kids of his own [13/F and 10/M] that I never really liked either. Like my mom, J has also had a divorce.
I've never told my mom that I dislike J. I think she knows I don't but I don't admit it. They are engaged; I'm not exactly pleased. 

Enough with the backstory, onto the real problem. The last few years, they have been having sex quite a bit. I mean, I guess I can understand as my mom had a vasectomy so she can no longer get pregnant. Obviously. This wouldn't be a problem but I hear it more often than I want. What makes matters worse is we all moved in together earlier this year (much to my dismay) and my room is RIGHT below theres. The only other room left is the guest room on the same floor as them. I'll pass. 

The bed squeaks REALLY bad and I can hear it. Sometimes even when I crank music up, I can hear it. They've done it numerous times whenever I've had my friend over and even when J had his kids over. Their wall shares a wall with the eldest's room. The fact that the youngest knew what they were doing even from age 6 makes this worse. I'm getting sick of this. I'm always home and I don't know if they know I can hear it or they are just stupid. 

I don't know what to do. I can't stand this anymore. I wanna talk to her before I blow up on her. What do I do? What do I say?
<bot>: My mom and fiance (whom I hate) are having sex a lot. Their room is above mine and their bed squeaks very badly. I wanna talk to her about it before I get pissed at her first.