Getting children to behave

Don't let the potty training become a battle of who is more stubborn. Chances are, the kid will win that battle. :) She wants diapers, let her have diapers. Maybe she's not ready. Or she is, but it's a control thing for her. Let it go, show her that you refuse to fight about it, and in time (most likely short time) she'll decide the diaper isn't as cool as she thought.

Clear consequences for actions for the rest. Sit down with them and make it clear, if you do X, then Y will happen. And stick with it. Don't threaten what you aren't willing to go through with. The first few times, they'll push. It's normal, they test boundries all the time. You just gotta be more stubborn and don't give up on that part. This is when it's important to keep your inner stubborn mommy  mode :)

Good luck!

 I am also potty training last night I put DS in bed with underpants because he decided that he wanted to be a big boy.... I Woke up to him screaming saying he couldn't get them off because he peed his pants.  Today I set a timer every hour he has to sit on the potty and go...  I give him a sticker when he does and after he earns 10 stickers we go to the dollar store and he gets to pick out a prize.  I say when potty training diapers at night during the day every hour put them on the potty and let them sit there with  "their shows" until they go...   Try stickers and dollar store prizes....  I like what the PP said... don't let it be a battle they are on their own time....

There are certain battles as a mother that you need to learn to fight or be left alone.

The potty training thing, is a battle you shouldn't fight about, like Wendy said, you'll loose. Clothing options, you'll loose that one as well. There are many many others.

But you need to learn how to put your foot down. My 4 year old is just now learning that we ignore her when she starts her over dramatic fits. Or she will just march right upstairs. When she is trouble, she is to sit on her bed, stop the crying, and have a converstation with her dad, and then only can she come out. But you need to stick to it.

You tell them one time what is expected at that time and then consequence.  They are definitely testing you and winning.  Siblings can and will fight on occasion.  The 3 yr old just may not be ready to potty train.

pull some Super Nanny tricks and write out a bulletin board for the kids to see and follow, with new rules and regs for the house.......with rewards for listening, and punishments for not listening, and a sticker chart for the potty training, earning extra big girl privledges for going on the toilet... and  a sticker chart with  even bigger privvies for the 7yr old who can be a helper to mom, instead of an annoyance.  If the 7yrs old wants to act like a preschooler, treat him like one.   And if your toddler can see over the next few months that you mean business with the others, discipline for the  youngest hopefully will be a little less trying. 

bumping for later, I could use some of this advice.  I have a almost 9y/o, a 4y/o, a 3y/o and a 9mo old... who argue and fight constantly - there's backtalk, constant whining/crying, and screaming.  Even the baby has taken to letting out a frustrated screech multiple times a day.  Oh, and the hitting... yeah. 

well the baby isnt really old enough for this but the other 2 are. corner, time out. make them sit on there bed or w/e ok you dont wanna eat dinner. stand in the corner instead. ok you dont wanna pick up your room. I will and you can stand in the corner while I clean it.. and im taking my time :)