It is reported by the Swahili Times.

Haitham bin Tariq Al Said ameteuliwa kurithi uongozi wa nchi ya #Oman kufuatia kifo cha binamu yake, Qaboos bin Said. Taarifa zinaeleza kuwa Haitham ambaye amewahi kuwa Waziri wa Utamaduni ameapishwa na Baraza la Uongozi la Familia lenye mamlaka ya kuteua mrithi ndani ya siku 3. pic.twitter.com/Di3tckbYyo

- Swahili Times (@swahilitimes) January 11, 2020

As noted, Heysam bin Tariq Al Saeed, the swearing oath, is the cousin of the deceased Sultan Qaboos bin Saeed Al Saeed.

The Sultan of Oman, who ruled since 1970, died at the age of 79 after a long illness.