I don't know about the family members being killed thing, but if you want to see a very well researched and cited discussion of the strong Saudi link with 9/11, here's an excellent spot:
http://billstclair.com/911timeline/m...almihdhar.html
Once more, it brings the reader back to the same question, why didn't we go after the people REALLY responsible for 9/11? When are we going to go after Bin Laden?