Write an introductory post about your character and his family life. Consider:
Name of your wife.
Names, ages and birthdays of your children.
Job and status.
Social class, education and parental upbringing.
Hometown, local area.
Family history - how did the war of 1914-18 affect the family?
N.B. They would not have called it 'World War One' or 'First World War'!
Political views - there were a lot of political parties to choose from - from the Communists (KPD) and Social Democrats (SPD) through to the Nazis (NSDAP). What party might someone in the social position of your character have been drawn to?
Finally, see if you can muster up some pictures from the internet.