# that day and hour

Here "day" and "hour" refer to the exact time that the Son of Man will return. 

# nor the Son

"not even the Son"

# Son

This refers to Jesus, the Son of God. It is best to translate “Son” with the same word that your language uses to refer to a human son. 

# Father

This refers to God the Father. It is best to translate “Father” with the same word that your language uses to refer to a human father.