Jesus was and is the Son of God, as detailed in scripture there are 3 parts of the Godhead.........the Father, the Son, and the Holy Ghost/Spirit. Jesus is God the same way that you are human..........His Father is God, therefore Jesus has the same essence (the same properties) as His Father. You being your father's son.........can you be anything other than human?
When Jesus came to earth He came as a human......the Son of Man. The Christ willingly made of Himself of no reputation (Phil. 2:7), He empited Himself, He moved from the spiritual realm to the physical realm (John 1:14). He voluntarialy became as all other men, He hungered, He thrist, He suffered from weariness, pain....etc., who for the first time "increased in wisdom" after coming to earth in the form as a helpless babe. (Luke 2:52). Thus while on earth in the flesh He voluntarialy placed Himself as subordinate to the Father.