TEHRAN (Reuters) -- Three sons of slain Iranian leader Ayatollah Ali Khamenei prayed beside his coffin and those of four other family members on Sunday, but Mojtaba, the son who succeeded him as Iran's supreme leader, did not make an appearance. State TV showed Mostafa, Meysam and Masoud Khamenei praying behind the coffins laid ‌out in the vast courtyard of Tehran's Imam Khomeini Grand Mosalla, a sprawling religious complex. Their father, alongside several other members of the family, was killed