The family has four children, and the mother has just had a baby. 4 children would have been rewarded with a bronze mutterkreuz
The mother is caring for the baby - her biological function
The mother is not skinny, she wears a plain dress, she has her hair in a bun; she is not wearing make-up: Her appearance is 'modest'
The family lives in a rural/farming environment. Hitler called the 'peasant' the purest part of the volk [people]
The boy wears his Hitler Youth uniform and is making something out of the clay.
The younger sister plays with a doll - preparation for motherhood.
The elder sister has plaited hair (acceptable fashions), and gazes longingly at the baby (longing for motherhood).
The family have fair hair, athletic bodies and ruddy complexions - they are the ideal Aryans.