The world's longest-reigning monarch, King Bhumibol has been on the throne in Thailand since 1946
The issue is critical in a country where the monarchy is considered pivotal to political stability, and where King Bhumibol, who turns 87 this week, is in such frail health.
Crown Prince Vajiralongkorn appears to be sorting out his personal affairs before the succession, so that he can choose who will be his queen, and who will eventually succeed him.