(This was originally a comment response, but the comment got deleted while I was typing it)
I went through a phase with my older sister.
To be fair to myself though, my parents constantly showered her with attention and praise, supported her hobbies (horses) while I was always kind of lost and got next to no support for my hobbies (art, computers). I would watch them spend thousands of dollars on horse shit and spend entire weekends at shows (getting dragged along to them) only to be told they couldn't afford art supplies or to upgrade our old Windows 95 computer and they didn't have time to take me to an art class (we were home schooled so, I couldn't just take one at school). So I resented her a lot. Caused a lot of tension. Did not help that she pretty consistently tried to tell on me and get me in trouble for anything that made me happy (such as video games or anime, she once got me in trouble by saying there was a sex scene in some Inuyasha movie I was watching with my friend... there was no such thing, just some slight suggestivity that wasn't super super inappropriate for a 12 year old).
So I began to retaliate in some less than mentally healthy ways. I'd go into her room while she was out and sabotage her shit. Install things on her computer account to try and get her in trouble. One time I tried to physically attack her because she was making fun of me and I was tired of her shit (by this point I had grown to be about 8 inches taller than her... I'm a pretty tall chick and she's very short). Pulled a good chunk of her hair out during that fight. Our family was pretty fucked and dysfunctional though so I don't think I am/was a sociopath I think I was finally at my breaking point... around 16-17 I went through a phase of trying to physically stand my ground during these dysfunctional implosions, though my mom put an end to that when she called the cops on me (she ran after me with a cane for not doing the dishes or some shit and I physically puffed up and shoved her down...) I am female but I take after my dad physically so I am MUCH bigger than my sisters and mom so when I was at my breaking point I tried to leverage that to get it to fucking stop.
Anyway, I am mostly a normal person now. Lotta anxiety and occasional depression, as well as some weird social ticks due to being Asperger's/adhd and not being treated for it most of my life. But I'm engaged and I have a good job, a house, and a dog I love very much. I'm glad I didn't become the person I could have become in my situation. My older sister and I still (mostly passive aggressively) hate eachother though. We're from two different warring planets, but thankfully as an adult there's been a ceasefire (for the most part). We only ever really talk/see eachother at occasional family things and we try our best to keep it civil. I'm repairing my relationship with my mom, but I don't know if I will ever get to that point with my sister, or my dad (that's a whole other bucket of beans I won't get into here).
Sorry for rambling.