Graca Machel has waived the right to half of the estate of Nelson Mandela, acting Chief Justice Dikgang Moseneke said.
President Jacob Zuma has expressed shock at the recent sexual attacks on young children and babies.
A statue of Nelson Mandela will be unveiled at the Union Buildings by the end of the year, President Jacob Zuma said.
The family of two Diepsloot toddlers killed last month have expressed shock over the death of a baby in the same area.
Nelson Mandela's ex-wife paid the the former president, who remains critically ill, two visits on one day.