Dream of kids

My dream is about my older son Alexander begin attacked by a man who wanted to kidnap him, he told me that the man was playing with kids and chasing them around, then the man turn around to him and told him that it's your turn, when i asked the man, he got a knife and swing it around, there was two police women dressing normal, when the man swings the knife i ran to Alexander try to pull him away from the man, Alexander was sitting on the cough, as i pull him the man swing the knife and cut my hand and swings again and cut Alexander throat then he place the knife on his hand, as i cry Alexander was calm with no face experience