What dose it mean when your child gets murdered in a dream?

Parents often use exaggerated expressions. For instance, a frustrated mother might say, "You kids are killing me!" In dreams, the subconscious mind will portray such expressions literally. So you might dream of your own kids shooting you, when the reality is that you are simply tired and frustrated and need a break.

From a different perspective, the people and things that appear in dreams frequently are symbols representing something else. In your dream, the children could represent a part of yourself. So the dream could be a message from your subconscious mind, telling you that you are doing something that is harming yourself. It could be something as obvious as substance abuse or smoking.