If you have kids, then you know that up to a certain age they have a strong desire to help mom and dad do just about anything. When appropriate, get your kids involved in what you're doing. Simple household tasks like recycling and using natural cleaning products are a great start. If you have teenagers in the house, you can get their help with brainstorming and working on larger projects like installing sustainable cork or bamboo flooring in your home.
One task that kids of all ages will want to be involved in is helping out with the family garden. Teach them about composting and the virtues of growing your own organic vegetables and herbs. Seeing food on the plate that came from seeds they planted is a big thrill for a kid, as well as a great lesson in sustainability.