a las vegas police officer always dreamt of having a big family. suddenly now he has one. cnn's natasha chen tells us how he went beyond the call to change the lives of five siblings. >> reporter: north las vegas police officer nicholas quintana always wanted a big family. >> want some ketchup? >> with what? >> with your chicken nuggets. >> reporter: but he and his wife never thought they would jump from having zero children to five. >> you do or you don't? >> no. >> then your brother will get it. >> reporter: quintana answered a dispatch call for shots fired at home. one parent is alleged to have killed the other. leaving five children at the house with no one to care for them. after leaving the scene -- >> i did something i had never done before, and i came back to this particular incident, i told them, make me a promise, i want you to promise me, you'll learn to forgive. >> reporter: their experience is something he can relate to.