Nelson Mandela's condition is "very critical" and "anything is imminent", his daughter Makaziwe Mandela said.
"I can reiterate that Tata (father) is very critical, that anything is imminent, but I want to emphasise again that it is only God who knows when the time to go is," she told broadcaster SAFM.
She says if the family speaks to Mandela, he responds and tries to open his eyes. Clan elder Napilisi Mandela says the former South African president is using machines to breathe.
The Nobel Peace Prize winner's health has deteriorated in recent days, prompting President Jacob Zuma late to pull out of a trip to neighbouring Mozambique.
