Socialisation is perceived as the process of developing the most basic and characteristic personality traits. This process walks hand in hand with the socially organised action of upbringing. The first environment forming of a person's experience is his family and relationships with the family members. Everything the child sees in his family is of great value to him, including the relationships between parents, their bad habits or addictions, the style of upbringing, attitudes towards work, social events, and needs of the child. All of this affects the development of the child’s morality, shaping his character, and creating his attitude towards himself and others. During childhood, children, directly or indirectly, emulate the actions and expressions of their parents and other people. By imitating they learn the behavioural and value models that dominate in the surrounding environment – they socialise. The process of socialisation is an integral component of a human lifetime. It dictates all the communicative processes and social adaptation throughout the entire lifetime. This article analyses the institutional environment impact of out-of-family care on the children’s socialisation process. It is imperative to understand the frequent problems of development of the personality of children that have grown up or are growing up in an out-of-family care institution in order to support these children in their struggles to adopt the models of positive communication and behaviour by identifying and theoretically explaining the causes for the failures in socialisation.