What influence was health disadvantage on constellation of siblings Author: Bc. Petra Slavíčková ABSTRACT The diploma thesis is focused on the topic of sibling constellation and how these can be influenced by health disabilities, specifically according to the birth order of the disabled child. This is a qualitative research. The data collection is made using interviews with young healthy adult siblings of disabled children. Categorical systems and data comparison sorted per younger and older siblings of disabled children are used for the analysis of collected data. The aim of this thesis is to broaden the issue of siblings of disabled children by a new point of view and find out which conformities and differences are between sibling constellations of younger and older siblings of disabled children. The outcomes of the research revealed numerous differences between younger and older siblings of children with disabilities in the fields of relationships, opinions and attitudes. It was found out generally, that the fact of sibling disability is perceived more by their younger siblings and this fact has a greater influence on their regular life. KEY WORDS family, siblings, sibling constellations, order of birth, health disabilities