Family is the fundamental environment that creates and determines the psychical and physical qualities of an individual, both on a conscious and unconscious level. These influences then directly affect the individuals life and have an effect on human biology and ultimately on peoples entire lives. As a family (or sibling) constellation, we define the order of birth of an individual and the influence which ensues as a result from his or her surroundings. The general diversity of siblings who grew up together has been repeatedly scientifically documented and some authors even state that siblings are often so different in their personality characteristics as two randomly selected individuals in the population. It has been shown that the order of birth significantly affects the psychological profile of an individual, their intellectual ability, health, sexuality, relationships and many other aspects.
This topic is studied by:
Radim Kuba, Jan Havlíček, Petr Tureček