The word Familia did not originally signify the ideal of our modern philistine, which is a compound of sentimentality and domestic discord. Among the Romans, in the beginning, it did not even refer to the married couple and their children, but to the slaves alone. Famulus means a household slave and familia signifies the totality of slaves belonging to one individual. The expression was invented by the romans to describe a new social organism, the head of which had under him wife and children and a number of slaves, under Roman paternal power, with power of life and death over them all.
Friedrich Engels, The Origin of the Family, Private Property and the State
family, philosophy, roman, society