This article addresses the legal situation of children in stepfamilies focusing on the interdependent rights and duties of the various adult family members towards their children. As soon as a new de facto parent joins a family, he/she finds him-/herself in a multi-person relationship involving his/her partner, the other legal parent and the child. If the family structure is not redefined through successive adoption, the result is a complex web of relationships that poses a number of legal questions.

The aim of this article is to provide a comprehensive overview of the representation of the vulnerable adults in Finland and to analyze whether the legal system lives up to the expectations of the UN Convention on the Rights of Persons with Disabilities (CRPD). The Convention lays down that a person with disabilities must have an equal opportunity to make decisions and receive the support they need in exercising their legal capacity. The representation of vulnerable adults in Finland is based on several statutes. Private representation plays a significant role as negotiorum gestio and field-specific statutes are important in health care and social welfare matters. Officially confirmed representation is based on the Act on the Continuing Power of Attorney and the Guardianship Service Act that cover representation both in financial and personal matters, but clearly have an emphasis on financial matters. The article argues that in principle the Finnish adult protection model follows the step-by-step approach required by the CRPD. However, whether and to what extent it respects the will and preferences of an adult depends on the subject matter as the legislation in force is ambiguous. Furthermore, in respect to private representation the issue of safeguards has not been resolved.

The phenomenon of ‘nesting’, which is of international importance, delays the entry of young people into adulthood. Thus, they start families later, which results in changes in the demographic and sociological structure of the society. Therefore, taking into account that nesting is a legal problem, it should be considered whether reducing the scale of this phenomenon requires changes in the law (both in individual countries and in European law). The article indicates exemplary research areas that may be analyzed in order to assess the current legal situation of adult children living with their parents or one of them. The aim of the article is also to draw attention to the different levels of nesting in individual countries and to reflect on whether the differences appearing in the legal systems of individual countries and the solutions adopted in them affect the scale of nesting.

Over the past 30 years, the European Court of Human Rights (ECtHR) has increasingly applied the best interests of the child (BIC) principle in cases involving children. However, in the absence of a literal reference to the principle in the European Convention on Human Rights (ECHR), the principle’s inherent flexibility paves the way for contestable applications that result in the protection of adults rather than children. This is particularly true in the area of family law, where the interests of the child and those of the parents are closely intertwined. Given these structural and ontological limitations, one should ask to what extent the ECtHR is consistent with a reasonable application of the principle. This article aims to analyse the ECtHR’s application of the BIC principle in the specific area of family law disputes concerning the recognition of parenthood established through adoption and surrogacy. In such cases, the Court faces the challenge of striking a balance in the triangular relationship between the interests of the child, the parents and the State, while operating in an area significantly influenced by the margin-of-appreciation doctrine.