Michael Smurfit's younger brother Dermot (71) netted €30m when the Smurfit cardboard box business was sold to private equity buyers in 2003.
He built up another company, Powerflute, into a sizeable player. Shares almost doubled as Madison Dearborn tried to buy the firm, with Dermot's 15.6pc stake now worth €51m. There are also investments in timber and financial services. Dermot's daughter is Hollywood actress Victoria Smurfit, while son Dermot Jnr runs listed gaming technology group Gameaccount.