The entire scenario is one which we must all think about even if we never face it, . . . remembering that every perpetrator of evil deeds is someone's sister, brother, aunt, uncle, son, daughter, etc, . . . and it may some day be our turn in the bucket to have a relative do something less than honorable.
I would probably be like most, . . . more prone to doing something non lethal, but only if it looked like it might succeed, . . . and if the knowledge of the person would give me reason to believe it would be a worthwile risk.
Pulling a firearm on a family member can be a stickly situation, . . . but I guess that I made up my mind long ago that sticking to facts will sort out what is right, . . . leaning toward emotion will get you killed, . . . so I will hopefully do what needs to be done for the moment, . . . without regard to the kinfolk element.
May God bless,
Dwight