What are you asking? You are making statements, but not asking anything. I am sorry for your loss. And the moron raping your sister should be shoot too. Actually, the word id "shot", not shoot. You "shoot" a gun, you GET shot. What a horrible life she had. Is the first child fathered by her "dad"? If it is so, it can be proven by a dna test and the bastard will go directly to prison. (After the trial.) Guys in jail love child molesters. They give them the same thing they were giving to their victims. He needs to be in jail. Or at the very least, outed for what he is.
You can use good old graffiti for this purpose.