i think what is shocking are the crimes being committed by younger and younger ages. when put into jail they suddenly become submissive to instruction. why? because they are probably threatened within an inch of their life. it's what they were seeking from their parents and never got (just kidding

). seriously, though - don't you think that there are some things that are life lessons? didn't you ever have a time where you did something bad as a child and you knew it? what makes your conscience clear is to absolve the problem by either saying 'i'm sorry' - or if very very stubborn (as you will often find 3-4-5 year olds) that WILL NOT SAY 'i'm sorry.' what do you do then? they are not sorry. what will make them sorry? a pat on the head and telling neighbors and friends they were born this way?
i'm sorry but not saying 'sorry' doesn't cut it. you are now in a battle. who's battle? the child's battle? no. you are a parent. you have to be proactive. you can say 'ok - but NEXT TIME - you have to say 'sorry.' when next time comes - are they going to say 'i'm sorry?' NO. they never will. they have developed a habit right then and there.
you can see it on playgrounds when a mom calls her child to come to her. (ok - i'm guilty- my children always say 'five minutes, mom.') but, generally - you need them to obey and be quick about it. what if it was a life threatening situation. are you going to argue with them about getting into the car or locking the door (or unlocking it!)
when you have children you are suddenly faced with some decisions. if you make none - and let the child make them all - who is running the show? the children. i don't care how genetically disposed they are to good behavior - there is always going to come a time when they challenge their parents. what do you do? always spank. of course not. but, they shouldn't challenge you every day. R- E S P E C T - a little respect. da da da da.
btw, i have three - and none of them were spanked much. and, yes - they are a bit spoiled, imo - but i try to do a combination of what promey says AND expect respect. do i always get it ? no. sometimes i wonder why - but for women it is much harder to discipline a child (especially of the opposite sex). it almost seems better for fathers to be the real disciplinarians of their sons - and mother's their daughters. it wouldn't work to have a sibiling spank a sibiling. they will never gain the respect even if it is called for. i think you need to have a gentle talk with your sister when she is calm and explain everything you did to us. and, explain about good behavior and bad behavior and that you feel that it is improper for you to spank her - especially since she is of the opposite sex - but that you WILL use (list items that will be either taken , or privileges taken) things that your parents have agreed upon for different infractions. then, hold to it. allow her to get her things back when she has complied with chores and rules.
not only that - you can take her to friends homes and gently let her watch how other families use discipline. rewards can be as simple as going out somewhere with you - or having time to play with friends - go to a movie. if rewards are OK - then punishments such as saying - you will not get to go to the movie until your room is cleaned up -is a motivating thing. relying on instinctual behavior might leave the room dirty for a month.