The parents of the now-estranged wife of Thailand's crown prince have been sentenced to two and a half years in prison on charges of defaming the monarchy, in the latest legal action against relatives of the former princess, who until recently was in line to be the country's next queen.

The well-publicized split of Crown Prince Maha Vajiralongkorn and his third wife, former Princess Srirasmi, has been accompanied by a public shaming of a number of her family members, who have been accused of insulting the monarchy, a crime punishable by up to 15 years in prison.

On Wednesday, a court found Srirasmi's parents had misused the crown prince's name during a dispute in 2003 with a neighbor who was then prosecuted on a bogus fraud charge.