In most civilized nations there is a sort of domestic condition, in which the superior is termed a master, while the inferior is termed sometimes indeed a servant, but more particularly and more frequently an apprentice. In this case, though the superior is, in point of usage, known by no other name than that of a master, the relationship is in point of fact a mixed one, compounded of that of master and that of guardian.
IPML Chapter 16 Section 3 Part 2