A large percentage of American families have low incomes, which lead to a host of challenges and disadvantages for both parents and children. In 2006, one out of every three families with children had incomes below twice the federal poverty level (FPL): $40,888 for a family with two adults and two children. While these families face many of the same challenges as other families, they are particularly financially vulnerable. This fact sheet provides statistics on the work effort, earnings, health care access and other characteristics of these families.