I think it's highly unlikely that the Saudi government had anything whatsoever to do with 9/11. The Saudi government were absolutely not friends with Al Qaeda. Not in the least.
Having said that, there are between 7,000 and 25,000 (depending on your source) members of the House of Saud. I suspect it's very likely that some of them had some involvement.
Of course the Saudi Government does not equal the House of Saud.
My brother is a smoker. Does that make me a smoker? Is it evidence that the production companies I work for support and promote smoking?
The answer to these questions are fairly obvious.