Yahya bin Laden

One or two of the bin Laden brothers are arrested over the attempted takeover of the Grand Mosque in Medina. One of the brothers is Mahrous, the other is, according to author Steve Coll, “probably Osama.”
Inside Job? – The mosque had been seized by about five hundred rebels opposed to the Saudi royal family, led by a militant named Juhayman al-Otaibi. The rebels had apparently used Bin Laden company vehicles to stock ammunition and food in the mosque prior to its seizure, indicating some people at the company were sympathetic to them. According to one account, the two brothers are not held for long; a bin Laden company employee will say the arrest is a mistake as the arresting policemen wrongly think the two brothers are conspirators just because they are monitoring police radio traffic. [Coll, 2008, pp. 225-228]
Mahrous bin Laden – Other accounts say that Mahrous, who joined a rebel group opposed to the Saudi government in the 1960s, is held for longer and only eventually released from prison because of the close ties between the bin Ladens and the Saudi royal family. Mahrous will abandon the rebel cause and join the family business, eventually being made a head of the Medina branch and a member of the board. He will still hold these positions on 9/11, although a newspaper will report that “his past [is] not forgiven and most important decisions in the [bin Laden family business] are made without Mahrous’ input.” [Sunday Herald (Glasgow), 10/7/2001; New Yorker, 11/5/2001; Ha’aretz, 12/18/2002]
Later Comment by Osama – Osama’s position on the seizure of the mosque at this time is not known, although he will later criticize the Saudi king for not negotiating a surrender. Coll will suggest that, although he is one of the most devout members of the bin Laden family at this time, he is not in league with the rebels as he is more concerned with his own material wellbeing. [Coll, 2008, pp. 229]
Older Bin Ladens Assist Besiegers – In contrast to Osama, several other family members, including Salem, Mustafa, Yahya, and Yeslam, work extremely hard to take back the mosque. As the bin Ladens actually renovated the mosque, they are able to provide the Saudi government with detailed plans to help their assault. After the rebels retreat underground, the family brings in equipment to drill holes in the floor, so that government troops can drop grenades down on holdouts. [Coll, 2008, pp. 225-226]