The crown prince has four sons by his second marriage, whom he disowned in 1997 when he severed all ties with their mother, Yuvadhida Polpraserth.
At the time the crown prince stated that they had renounced all their royal titles. But the palace continues to recognise their right to use the title HSH, or His Serene Highness, even though the boys, now grown up, are banished from Thailand and live in the United States.