Tedros Adhanom Ghebreyesus, the leader of the World Health Organization (WHO), is in the rare position of heading a UN agency’s response to a humanitarian crisis in which his own family’s survival is at stake. Tedros, 57, hails from Tigray, the besieged northern region of Ethiopia gripped by two years of fighting and misery. Last week’s ceasefire deal between Ethiopia’s government and Tigrayan rebels raised hopes that the brutal situation in Africa’s second-most-populous country could ease. “We are glad that peace is being given a chance,” Tedros told a press conference on Wednesday. But he in…