His father , Heinrich Kepler , earned a precarious living as a mercenary , and he left the family when Johannes was five years old .
By the time Johannes was born , he had two brothers and one sister and the Kepler family fortune was in decline .
Kepler 's father , Heinrich Kepler , earned a precarious living as a mercenary , and he left the family Johannes Johannes was five years old .
By the time Johannes was born , he had two brothers and one sister and the Kepler family fortune was in decline .