Presidential spokesperson Mac Maharaj and his wife Zarina have denied allegations that they took bribes for a 1990s tender for new drivers' licences.
Presidential spokesperson Mac Maharaj's sister-in-law has spoken to the M&G about her knowledge of a secret Swiss account.
In an interview with the M&G, Shirene Carim, Zarina Maharaj's sister, expands on her reasons for coming forward now.
The rows over Mac Maharaj and Willem Heath are a new phase in an old war between the acolytes of Thabo Mbeki and the minds behind Operation Vula.
Reports have revealed that Mac Maharaj and his wife Zarina were willing to disclose sensitive ANC activities to avoid criminal investigations.
A trail of evidence seen by the M&G shows Mac Maharaj as transport minister took payment after payment from contract bidder Schabir Shaik.
Mac Maharaj faces a predicament on how to respond to the serious allegations levelled against him in media reports on his section 28 testimony.
President Jacob Zuma's spokesperson Mac Maharaj stands accused of receiving millions in bribes from French arms maker Thales.