What has happened about the probate of father's will. Is it intestate? If the will is not settled, the fathers income tax file continues and the administrator is the represenative assessee who handles the income received of the father. This income may have already been accounted in the hands of the father and it may have been reflecting as a sundry debtor. If the will has been settled and as a legal heir you have appropriated the money, for you it is other than adequate consideration but you can claim it as inheritance if it indeed reflected in your fathes business. If the will is not settled you are the debtor to your father's estate to the extent of money received by you.
My view. Please consider other opinions also as I have not come across any such situations and what I have expressed is purely from applying logical reasoning.