I have an 18 year old son, a 16 year old daughter, a 14 year old daughter, a 12 year old daughter, a 10 year old son, an 8 year old son, a 6 year old daughter, a 4 year old daughter, and a 2 year old daughter.
I want to start with discipline. We never let disobedience go to the point of ugliness. We address attitude issues early on, before they've had a chance to turn into habits. Bad habits are destructive. For example: If the child is displaying signs of having an ungrateful attitude, rolling eyes, stomping, slamming things, stomping away. That is the time we start the discipline process.