Your sister is a criminal who made the choice to involve herself in a horrific, inhuman crime. As the other posters have stated, she also chose to drive that night, enjoy Josh Proutey's sandwich, and fill her car up with gas, all while Josh Proutey was dying in the parking lot where they shot him. Just like the rest of the group involved in this crime, your sister is an immoral animal. She could have, at any time, chose to stop, but she did not! Time for everyone, including her family, to be responsible and accept the fact that she is a dangerous criminal that deserves harsh punishment!