Talk less, listen more. Eliminate or restrict the amount of caffeine in your diet. Take a nice warm shower or bath. Sit down and sing some songs with your children. Be practical when buying household furniture etc.
Expensive items spell stress.
Do a kind deed for someone else. Include your children as this trains them to do kind deeds too. Put a special stick-on pen by the phone with a pad for messages. Leave the kitchen clean and tidy every night. Train your children to politely answer the phone and door.