I've two dds 6 and 3. They are lovely girls, but I just feel so ineffectual with them, and I can see that other parents have much better control over their children - e.g. they come when called, or stop when told to do so. Mine just ignore us and carry on regardless. We have simple rules and are fairly consistent about enforcing them: elder child is quite oppositional at times and refuses to listen when you tell her off (covers her ears and says "I'm not listening" etc. Infuriating. Or when you say "don't do x" she immediately does whatever you've just asked her not to do). Younger child is feisty and strong-willed, but clearly just follows her older sister's lead.
Not only are simply everyday operations a total pain, I do worry about them as they grow older.
Ideas?