My niece is being spoiled rotten, what can I do?

She is your sister (or brother) child, not yours. As unfortunate as it is, no matter what you do, the parents will override you. And if you push to hard, the child wont like you. Now if you were the parent, that would be tough and she would have no choice but to follow your instructions, but you are not, so you may ruin your relationship with the child. Talk to her parents about your concerns, but do it in a non offensive manner, perhaps it will work.

the same thing is going on but my 8 yr old niece who now lives with my 68 year old mother and noticed how much of a liar and con artist she's turning out to be .Its hard because my mother is getting worn out and tired of this daily struggle of getting this off the wall add child to school in time etc .She hits my mother and if I try to reprimand her I get yelled at like it's not my business .My mom gives her what she wants just to be able Stop hearing her carry on but all that does is make her worse .Its a vicious unhealthy circle smh .

Send them a book on good child rearing practices, but almost anything you do will be likely taken the wrong way.

Chances are the best thing you can do is spend time alone with your niece and teach her good manners or say nothing.

Sorry, but there is really nothing you can do. Her parents will raise her how they see fit and you are too far away to have much of a daily influence.

kick the **** outta her