Ignatius has written a good background: The Khashoggi killing had roots in a cutthroat Saudi family feud
https://www.washingtonpost.com/opinions/global-opinions/the-khashoggi-killing-had-roots-in-a-cutthroat-saudi-family-feud/2018/11/27/6d79880c-f17b-11e8-bc79-68604ed88993_story.html
The Emir of Qatar received a written message from the King of Saudi Arabia, inviting the Emir to attend the 39th Summit of the Supreme Council of the GCC, to be held on Dec 9.
https://twitter.com/QNAEnglish/status/1070035664689946625
Perhaps this is correct:
Saudi King Salman is to have agreed to a proposal by his brother Prince Ahmad to set up an advisory team to provide him with advice and consultancy about the transition of power in the Kingdom.
http://www.tacticalreport.com/view_news/Saudi-King-Salman-Prince-Ahmad-and-transition-of-power/5973