Aristotle, Nicomachean Ethics
H. Rackham, Ed.

But there is a different kind of friendship, which involves superiority of one party over the other, for example, the friendship between father and son, and generally between an older person and a younger, and that between husband and wife, and between any ruler and the persons ruled. These friendships also vary among themselves. The friendship between parents and children is not the same as that between ruler and ruled, nor indeed is the friendship of father for son the same as that of son for father, nor that of husband for wife as that of wife for husband; for each of these persons has a different excellence and function, and also different motives for their regard, and so the affection and friendship they feel are different.