Mar 2:28 Therefore the Son of man is Lord also of the sabbath.
Christ first refers to himself as the "son of man" in Mat 8:20. He uses it in Matthew over 30 times, in Mark 15 times, in Luke 25 times, and in John a dozen times. No one else uses it in the Gospels except the people in John 12:34 who want to know what the term means. Christ answers metaphorically, referring to himself as the light who allows people to see where they are going and to those who trust in the light as "children of the light."
This metaphorical answer fits nicely into the purpose of this blog.
Christ discusses the parent-child relationship many different times in the Gospels. In all his uses, sons are subject to their parents, servants who do their bidding. Here, Christ uses the word for "master" to contrast it with the idea of a son. In Mat 22:45, Christ uses this same contrast of terms to question how a "son of David" could be also his "master" since the terms have opposite meanings. By calling himself, a "son of Man," Christ was saying that he wasn't humanity's master but its servant.
Since Christ recognized God as his Father (and our Father), how can "man" also be his father? Mankind wasn't his father but rather his mother, through Mary obviously, but there is a symbolic marriage here between God and Mankind, where the result is Christ.
"Son" is from huios (huios), which means a "son," and more generally, a "child."
"Lord," is from kurios (kyrios), which means "having power," "being in authority" and "being in posession of." It also means "lord," "master of the house," and "head of the family."