To understand why Saad Hariri, the son of Rafiq Hariri, is under house arrest, the following must be known:
"Rafiq Hariri was the illegitimate son of the late Saudi King, Fahd bin Abdel-Aziz. He did not recognize him publically, because his mother was married to Baha'eddine when the affair happened. But he made sure the family had plenty of money to raise Rafiq.
When Rafiq became of age, he went to Saudi, to his father's kingdom. When Fahd became king in 1982. Rafiq's wealth began to multiply.
Rafiq has a son named Fahd. His is younger than Saad.
This makes Fahd bin Abdel-Aziz, the grandfather of Saad Hariri and Abdul-Aziz his great granpa.
Now that Saad has his first son, he named him Abdel-Aziz, hopefully one day he can reclaim the kingdom of his great great grandfather."
So Saad Hariri is the illegitimate grandson of the late King Fahd....
A branch of the family directly competing with the current Crown Prince MBS....
Saad could have been the organizer of a counter coup of other members of the Saudi royal family, so has to be kept under lock and key....