1. Beaten no - but disciplined with extremely unnecessary force either with hand, belt, or other object - yes. I still have a scar the welts a brutal spanking left. If someone did something wrong at my dad's and no one would fess up, he would line us kid up (except of course for his precious first born) and rotation spank us until someone admitted to it. (most of the time admitting to it just to stop the spanking). My mother had a fierce temper and seemed to lose touch with reality when disciplining.
2. Stopped when I moved out.
3. Even if they were not JW's they still would have had temper and self control issues.