In the scientific article, the author conducted a scientific study of the foreign experience of legal regulation of contractual relations between mother, father, and child, including under the legislation of the European Union states. Based on the conducted research, the author concluded that the legal regulation of the conclusion of contracts between the mother, father, and child under the legislation of the European Union states is mainly carried out through the determination of the possibility of concluding contracts, without clarifying the provisions on their form and essential conditions. In particular, the possibility of concluding a "statement on the exercise of parental rights" ("agreement of parents on establishing the procedure for the exercise of parental rights and determining contributions for the maintenance and upbringing of a child") under French civil law is defined in this way; "agreements on the method of providing maintenance" and "applications for acceptance of parental care" under German civil law; relevant agreements under the legislation of Latvia (agreement of parents: on determining the child's surname, cancellation of adoption, on establishing joint or separate parental care of the child, on establishing the terms of communication with the child of the parent who lives separately), Estonia (agreement on the fulfillment of the obligation parents regarding child maintenance), Czech Republic (agreements: on establishing paternity, on exercising mutual parental rights and responsibilities, on establishing the terms of communication with the child of the parent who lives separately from the child, on managing the child's property, on exercising parental rights and responsibilities after divorce, about the payment of alimony), Poland ("declaration of the spouses about the child's surname", "agreement on how to exercise parental responsibility and maintain contact with the child, in accordance with the best interests of the child"), "agreement on the rules for determining contact between parents and children"), Bulgaria (agreement on the place of residence of children, parentage, personal relationships, etc child support). The legislation of these countries (except Bulgaria) limits the possibility of regulating relations between parents and children by a marriage contract; Czech and Polish legislation also allows the conclusion of alimony contracts regarding the maintenance of children of their incapacitated parents. Hungarian civil and Moldovan family legislation more broadly define the essential conditions and form of contracts between parents and children, primarily regarding the contract on providing maintenance to a participant in family relations and the contract on communication with the child. In the author's opinion, the experience of these states should be borrowed, and the same detailed regulation provided for in the Family Code of Ukraine.