You Must Win

What demerit did her younger sister make with her husband that caused her to be shot and paralyzed for 30 years? Her husband died in 2006 from a heart attack. Where did he go? Is he being punished for the demerit he performed against her? What merit caused her to be the owner of the land full of slate? This land provides her with constant income and no matter how much slate is dug up, there is even more available.