Clubbing of income-disabled son !

As per Sec 64(1A) of the IT Act,1961, if a minor child suffering from any disability of the nature specified U/s80U, the income of such child shall not be included in the hands of the parent but shall be assessed in the hands of child himself. 

If the disability is not the one which is specified in sec 80U, then the income shall be clubbed in the parent's income whose income is higher after giving the exemption of Rs.1500/-.

You have to verify Sec 60 also as it says, when income alone is transferred without transfer of the asset giving rise to such income, it is deemed to be income of the transferor. It does not matter whether such transfer is revocable or irrevocable.