Don't give very small children unnecessary choices (would you prefer rigatoni or fusilli? or do you want to wear the blue dress or the pink dress?).
If a young child makes a request try very hard to be accommodating. That way you will say no rarely.
If you say no stick to it.
Don't shout.
Make sure everyone gets sufficient sleep.
Never lose your sense of humour.
Eat together as often as possible.
For teenagers, make sure you give them quality advice when they need it.
Teach your children (age appropriately) how to sew on buttons, polish shoes, make tea, re-pot a plant, sweep the drive, mow the lawn, bake a cake, make a bed, work the washing machine, cook the odd basic meal, peg out washing.
Make your home somewhere where people of all ages are welcome.