Its not a siblings responsibility to take care of their other siblings, its the parents responsibility?

you have a good point, maybe you need to tell your parents that

If a couple gets married and each of them has children, then sometimes it's going to feel like things may not be on an even keel. It's just life.

Its not a siblings responsibility to take care of their other siblings.

Actually in many cultures and families, it is. That is becouse the parents need to be out and about to support those children or it is simply tradition.

because parents need to stop choosing step children over their own children, because its not fair.

Has nothing to do with whom is raising the children, totally separate debate. Life isn't fair, get used to it, better to learn that now while young as opposed t getting slapped in the face with it fresh out of college. As is part of the issue with today's young adults.

The step kids verse real kids and how parents treat them is an age old story, Cinderella or was it sleeping beauty comes to mind. One or more of those fairy tales deals with the evil step parent thing. Any who, there is nothing you can do to alter how a parent treats you besides talking to them. More often then not they won't admit nor change anything. That is when you must give up trying to change them, revolt against them, wish things were different, ect.. You must buckle down on school work, it is the only option that gives you a way out at 18 and still builds for some sort of future. Blow off school and you'll be stuck in what you have right now, no options. Run away and life will be worse plus once again, limiting options. Do well in school, get offered ways out, live away at college. You have removed yourself from a bad situation while at the same time, creating even more options for your future. Good luck, life doesn't always have to suck, it will become what you make it become.

Yes

Agreed.

society is the main cause of the breakdown of the family values in this country

Do you have a question?

Everyone in the home is generally expected to do some chores that are age-appropriate. Babysitting is often one of those chores in households where there are multiple children. No of course children shouldn't be taking on the role of parent or primary caretaker, but there is nothing wrong with occasional babysitting responsibilities.