This diploma thesis deals with the topic of "Family in the classes of fundaments of civics and natural science at the 1st level of primary school". Among the main aims of this study is to determine teachers 'awareness of pupils' families, as to which difficult situations they usually encounter in practice and how the teachers present the given topic in the classes of fundaments of civics and natural science and besides in the context of various family forms build-up. The thesis is divided in two parts. In the first, theoretical part, I'm trying to explain the school subject of fundaments of civics and natural science, to briefly characterize a family with its evolution from prehistorical to recent times, while also mentioning an overview of demographic changes related to this field. The second, practical part brings results of a mixed methods research carried out among teachers at the 1st level of primary school. Questionnaire and interview method was used for research survey.