...were the 9-11 victim’s families able to sue the Saudis?...I can’t remember.
No. The case was dismissed at the behest of the Department of State aka The Bush Administration. That dismissal was appealed to the Supreme Court and was herd last spring. The Obama administration sided with the defendants as well. SCOTUS upheld the dismissal. I can't remember the case name - it was class action - but I can look for it if you're interested.