I'm sorry to hear that this happended to you. It sucks when you have something taken from you, but it REALLY sucks when something is taken from your loved ones, especially if you can't control it.
I feel for you and your family. Though this really angers me and I would love for someone to shoot them, myself being one of them, I know they must have issues. Noone who is raised right would do this. That tells me they have problems at home or they have not so good parental figures. Hopefully they will get caught, arrested, and possibly learn their lesson?
If you or your family need anything don't hesitate to ask. I'm sure I speak for everyone here when I say this.