I use the term "chores" loosely because we're talking about cleaning patios and yards. But you get the drift, we're talking about keeping your patio and yard well kept in all of its splendor, with help from the kids.
Here's a guide to which patio chores kids can do around the patio/yard, organized by age group. Once a child reaches a certain skill or age level, he can generally do the chores for his age group and those for the age group below.
Of course, some of these chores need to be done each day, others once a week, and still others once a month or even less frequently. Use your best judgment for what gets done when.