The amount will be taxable in the hands of the father, as this can be contended as a revocable transfer. This is just a deposit and at any time may be withdrawn and can be paid to father. It is really difficult to prove that this is an irrevocable transfer of assets and sec 61 will apply.
In my view it may be possible that the father can take the money and make a gift deed in the name of the son, which will not be taxable in the hands of the son u/s 56(2) being transfer to a lenial descendant. The son may take the money and invest in his own name (assuming that he falls below the maximum amount not chargeble to tax, or is in lower tax bracket than father.