(Pretoria, South Africa)  --  An affidavit filed by family members says "Nelson Mandela's health is perilous."  The document dated last month says the former South African president is assisted in breathing by a life support machine, and "the anticipation of his impending death is based on real and substantial grounds."  The African newspaper "Mail & Guardian" says the affidavit was filed in court by Mandela family members who are in a legal battle with other relatives over where the 94-year-old anti-apartheid revolutionary will be buried.  Mandela remains in a Pretoria hospital where he's being treated for an ongoing lung infection.