The royals and four other co-defendants were sentenced yesterday. They were initially accused of insulting Kuwait's Emir Sheikh Sabah Al Ahmed Al Jaber Al Sabah and fabricating videos incriminating high-ranking judges.
The former head of Kuwait's National Security Office Athbi al-Fahad Al Sabah, who is the ruler's nephew, is among those convicted.
The 122-page ruling, obtained by The Associated Press today, references phone logs from the WhatsApp messaging service of the defendants planning to publish anonymous Twitter posts sharing fabricated videos of judges receiving bribes.
All can appeal.