Gal 4:1 declares "Now I say, as long as the
heir is a child, he does not differ at all from a slave although he is
owner of everything,..."
The NAS New Testament Greek Lexicon
Owner - Kurios (Greek):
Definition:
"he to whom a person or thing
belongs, about which he has power of deciding; master, lord;
the possessor and disposer of a thing
the
owner, one who has control of the person, the master
in the state: the sovereign, prince, chief, the Roman emperor
is a title of honour expressive of respect and reverence, with which servants greet their master
this title is given to: God, the Messiah