Augsburg Confession XIV: Of Ecclesiastical Order
Of Ecclesiastical Order they teach that no one should publicly teach in the Church or administer the Sacraments unless he be regularly called.
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)