My family was a lot like that too...

Some examples: I had to help take care of my mom's homedaycare. All the time. If she was booked to the full, I wasn't allowed to go and visit other people. My brother never once had to help, and often had his friends over WHILE I was having to help.
My brother was allowed to use the riding lawn mower. I was never allowed near it.
Mom expected to teach me how to cook a few meals and then I would start cooking a few meals a week - I refused when I learned that my brother and dad would not be taking part in this sharing. So my mom refused to ever help teach me to cook.
My brother was in Scouts, Hockey, Baseball, and then was in school sports like Soccer, volleyball, band.
I was allowed to be in Girl Guides. Anything else was ixnayed, due to costs and the fact that dad couldn't drive me there. Yet dad managed to be home to take my broher to his hockey games, and hockey was massively more expensive than anything I wanted to do. I didn't even want to be in Girl Guides.
Punishments to me had to stick. Punishments for my brother lasted less than an hour.
My brother's lower grades were never an issue. I, on the other hand, was expected to get good enough grades to go to university, and pay for it myself.

etc etc.

And yes, I got called all sorts of names any time I stood up for myself. and my mom and brother would egg me on until I finally gave them the response they wanted; to yell back. That way they could tell me to stop yelling and to talk calmly.

It was ridiculous. I got out as soon as I left for uni, and it was the best thing that ever happened to me. I have essentially not contact with my brother, my dad talks through my mom, and my mom I talk with via text messages. I see them usually once a year.

There is hope for you, trust me!