Three of late Iranian supreme leader Ali Khamenei's sons made a rare public appearance at his funeral Sunday, but there was still no sign of his successor and other son, Mojtaba Khamenei.Crowds of thousands filled the Grand Mosalla religious complex in Tehran for a second day to attend the ceremonies for Khamenei and four family members killed on February 28 in Israeli airstrikes based on US intelligence.As well as laying to rest the man who ruled Iran for over three-and-a-half decades, the funerals are a chance for the authorities to burnish their resilience after five weeks at war with Israel and the US.The ceremonies were marked by the appearance of Khamenei's eldest son Mostafa and younger siblings Masoud and Meysam, all clerics. But their presence highlighted the absence of Mojtaba Khamenei, named supreme leader shortly after his father's killing but yet to appear in public.Officials have said he was wounded in the airstrikes, though the severity of his injuries remains unclear. So far he has communicated only through written statements, amid speculation he is too badly hurt or too concerned over the risks of being targeted to emerge.A funeral procession is planned for Monday in Tehran, followed by events in Qom Tuesday and in Iraq's holy cities of Najaf and Karbala on Wednesday, culminating in Khamenei's burial in his hometown of Mashhad on Thursday. The burial will be closely watched to see if Mojtaba Khamenei appears.The Middle East war is on hold following a ceasefire and an initial accord with the US, but both sides have warned they are ready to resume action. Vengeance was a major theme at the funerals, with mourners demanding punishment for those behind the killings.