For pure pathos I would go with Mill O' Tiftie's Annie as mentioned previously.

For malevolence in the brother-gets-sister pregnant-then kills-her genre I would suggest "The Rich Man's Daughter" not already mentioned which ends with the lines:
"so the rich man's daughter died that day, her child it died within her
But the rich man's son still goes his way, a vile and dreadful sinner"
No repentence there then.

Helen