There are realities which you must know nowadays in order for you to be fully aware of what is really happening when it comes to child custody. First, an estimated 13.7 million single parents in the United States have custody over 21.8 million children under the age of 21. Second, an estimated 82.6% of custodial parents in the United States are mothers. Third, an estimated 17.4% of custodial parents in the United States are single fathers. Please see infographic below for more details.