CAIPTAL GAIN AVOID

HI

IN 1950 SOMEONE'S FATHER  GOT A LEASE HOLD LAND ON HIS NAME,HE CONSTRUCTED.THEN IN 2004 IT GET CONVERTED INTO FREEHOLD  ON HIS SON'S NAME. THE FATHER DIED IN 2008. WHAT CAPITAL GAIN TAX  IF PROPOSED TO SELL IN 2009? IF VALUES ARE

ON 1981-1LAC

ON 2004-4 LAC

ON 2009-15 LAC(PROPOSED TO SELL)

HOW CAN C.G BE AVOIDED?

SOME CLUES- BACK DATE REGISTRATION,BACK DATE GIFT(THEN WHAT ABOUT GIFT TAX)

ALSO TELL ANY OTHER C.G OR PENALTY AS TRANSFERED ON SON'S NAME WITHOUT TAX?

TELL ME GUYS ,REALLY INTERESTING