CAn someone give me a code that will kill my player object and all of its children. I am new to unity and have no idea how to do this please help thanks.
Destroy is what you are looking for.
When you destroy an object with children, the children go away too.
plenty of tutorials in the learn section, they’ll walk you through how to destroy things, for example:
http://unity3d.com/learn/tutorials/projects/space-shooter-tutorial