"God instituted marriage before all other estates, and therefore created man and woman … that they should live together, be fruitful, beget children, and nourish and train them to the honor of God." (Martin Luther, Large Catechism, 1529)
2. Spiritually responsible head of household, including the housefather as assisted by the housemother.
>> Example: "As the Hausvater should teach it [Christian doctrine] to the entire family ..."
(Martin Luther, Small Catechism, 1529)