Litigation suing who? Were you hoping to sue Bin Laden, or are you talking about suing the Airlines?
I did not have any relatives die in the attacks.
Did you Sister in Law sign the forms?
The way I see it your sister in law did not have to spend 5 seconds in litigation if she would of chosen not to sue anyone.
That has to be a hard thing not to do, though. Among the 3000 dead, all it takes is one leftwinger to threaten to sue and win, and if he does, the others feel like chumps. They have to sign on, too. I don't blame them, I don't know what else their alternatives were, other than to watch leftwingers benefit while they didn't. They had to get on the bandwagon if one leftist was initiating a lawsuit. Otherwise the leftist would get money and they wouldn't. I can't heap too much judgment on them for that just because of the group dynamic.
That said, I think the dead should be recovered to the extent possible, no one should be endangered recovering the dead, the economic life of the city should not shut down, the bathtub should not be broken and the city flooded just to recover the remains and the skyscrapers should be built. The one thing that should not happen is that dynamic, unique lower Manhattan be turned into a disgusting tourist meadow with no economic activity just as the terrorists wanted, turning Manhattan into a New York version of a taliban cave.
In answer to your last question, she did not sue the government and never would. Beyond that, I will not discuss her personal business.