Income Tax authorities in Kochi say, they have unearthed black money in possession of three relatives of former Chief Justice of India justice K G Balakrishnan during their investigation into allegations of amassment of wealth by them.Director General of Income Tax (Investigation), Kochi E T Lukose, told reporters that they have found black money with his two sons-in-law P V Sreenijan and M J Benny and brother K G Bhaskaran. He said investigations are on.