Matt.23
[9] And call no man your father upon the earth: for one is your Father, which is in heaven.
And when Jesus prayed to the Father he called Him Holy. I reserve this name for Him alone.
John.17
[11] And now I am no more in the world, but these are in the world, and I come to thee. Holy Father, keep through thine own name those whom thou hast given me, that they may be one, as we are.