Maintenance is a family law institution based on the mutual assistance of all family members, according to the principle of family solidarity. Parents and children are the closest blood relatives. To each parent, the birth of his child is the most beautiful thing that can happen to his life, so the emotional connection between parents and children arises. Each parent must provide living conditions relevant to the child's development. It is natural for parents to help their children in certain ways: they raise them, educate them, support them and, over time, prepare them for an independent life. When they are born, the children become dependent on their parents and the parents are obliged to support them. Parents are required to support their children in a variety of ways but the most important way is to provide financial support to children. When it comes to a minor child, his parents keep him as compulsory as when the child completes primary education, even though he does not continue further education. Maintenance may also be extended to an adult child if he or she continues to be educated and fulfills his or her obligations or cannot be employed after education or is incapable of working due to illness or mental condition. As we can see, it is a very important element of schooling. Every child's interest must be in schooling as children's education is the parent's most important task. There are various cases where parents are denied child support due to certain situations, so the child is forced to take certain legal actions in order to achieve maintenance. This paper will show the maintenance of children with differences between a minor and an adult child, procedure sin which maintenance is decided and the application of international and European legal sources covering the maintenance institute.