Whether we are single children, older or younger brothers or sisters, whether our parents come from small or larger families, how well the experiences of the spouses in their families of origin fit together and how the succession of children fits - these and other characteristics of family constellations are important for our development and our later life. In this diversity, readers also find information about their own family constellations and how well or badly certain sibling positions harmonise on average. For example, the prognosis for a family in which the father is the youngest brother of sisters and the mother the eldest sister of brothers is very favourable. If, on the other hand, the father is the eldest brother of brothers and the mother the eldest sister of sisters, then it is likely that ranking and gender conflicts will severely disrupt, if not threaten, the relationship.