Once you have begun your own practice of mindfulness and have branched out into mindful parenting, advocates believe that you should teach it to your children. It can start with something as easy as teaching them to breathe deeply when they're upset. This helps them to learn how to control their emotions.
Another important part of teaching mindfulness to your children is to teach them gratitude. You can do this by modeling grateful behavior for them and by teaching them to be grateful for what they have. For example, if you have a moment in the day in which you are together with your child(ren), talk about your day with them. Talk about something good that happened and tell them something for which you are grateful. Ask for their answers on the same topics.
In addition, you can extend your practice of mindfulness to your children by teaching them to meditate. Children, even those under 10, can be taught to meditate. They likely will not be performing extended feats of Zen meditation, but they can sit quietly and focus for a few minutes. Deepak Chopra's The Chopra Center advises that children can be expected to sit for about as many minutes as their age in years - so you could start your seven-year-old with seven minutes.