Anything is possible in the court system. You will most likely have the case go in front of a grand jury to let them decide.Can they sue yes if they're still alive.Will they get anywhere with it depends on where you live.If they die then their family will most likely sue. In tennessee here we have what is called the good samaritan law it's a big help here in regards to a lawful shooting. So the best way to win a court case is if there is only one story told.