Great thread! I have 4 sibs and 1 cousin who counts as one. Between the 5 of them, I have about 16 neices/nephews in the tween/teen age group. It's been fascinating for me to compare parenting styles.
We were raised like Momto1son and I appreciated it even then! Of course all of us tested the boundaries, just to make sure. And we learned quickly why this wasn't smart. There was only one rule in our house, and it was "obey your parents". This was a pretty good catchall for everything.
Consistency is so important. Take backtalk. My 2 brothers have a zero tolerance policy. It almost never happens, because these kids know there will be quick consequences. So they're very respectful. My sister, about whom I've started at least one thread in here, is a very different parent. Her kids are a little younger, but so disrespectful and full of backtalk. Nine times out of 10, her response is "Stop with the lip". The other time the response is: "If you don't stop with the lip, you're not getting dessert".
Neither is discipline, and neither is consistent. And "the lip" gets worse by the day.