Emilie was the youngest child of a distinguished Basel churchman and academic, Samuel Preiswerk (1799–1871), and his second wife.
Preiswerk was antistes, the title given to the head of the Reformed clergy in the city, as well as a Hebraist, author and editor, who taught Paul Jung as his professor of Hebrew at Basel University.
Although she was normal during the day, Jung recalled that at night his mother became strange and mysterious.
He reported that one night he saw a faintly luminous and indefinite figure coming from her room with a head detached from the neck and floating in the air in front of the body. Jung's mother left Laufen for several months of hospitalization near Basel for an unknown physical ailment.
Their first child, born in 1873, was a boy named Paul who survived only a few days.
Being the youngest son of a noted Basel physician of German descent, also called Karl Gustav Jung (1794–1864), whose hopes of achieving a fortune never materialised, Paul Jung did not progress beyond the status of an impoverished rural pastor in the Swiss Reformed Church; his wife had also grown up in a large family, whose Swiss roots went back five centuries.
Among the central concepts of analytical psychology is individuation—the lifelong psychological process of differentiation of the self out of each individual's conscious and unconscious elements.
Jung considered it to be the main task of human development.
"Personality Number 2" was a dignified, authoritative and influential man from the past.
Although Jung was close to both parents, he was disappointed by his father's academic approach to faith.