return not submitted

MY FATHER WAS PURCHASE A LAND ON 1984 RS. 84000/- ON 18/10/1912 HE SOLD THE LAND AT. RS. 1815000/- AND PURCHASE REC BOND THE FULL AMOUNT, HE HAS NO OTHER INCOME , SO HE NOT SUBMIT ANY INCOME TAX RETURN SINCE 2003, NOW INCOME TAX DEPARTMENT SEND A LETTER TO MY FATHER ASKING 100% TO 300% PENALTY DUE TO NOT SUBMIT ION OF RETURN , can my father submit return for 2013-2014 within aug 2013, ar any other way can income tax department can charge penalty ,
NOW MY QUESTION IS :- 1.IS THERE ANY TAX LIABILITY IN THE HANDS OF MY FATHER ? 2.WHAT IS THE AMOUNT INCOME TAX DEPARTMENT CAN CLAIM? if return not submitted/ PLEASE ADVICE