of = concerning. Greek. peri. App-104. knoweth = has any intuitive knowledge. Greek. oida. The same word as in verses: Mat_24:42, Mat_24:43 ("known"); not the same as in verses: Mat_24:32, Mat_24:33, Mat_24:39, Mat_24:43 ("known").
Father.App-98.
only = alone. Not the Lord as "the Son of man", though surely as "the Son of God".