Four children who were killed in an Oklahoma City house fire last month were born in Northern Nevada and once lived in Gardnerville and Smith Valley.Natalie Marie Leon, 8, Samantha May Leon, 7, Matthew Zackary Leon, 5, and Kara Lily Leon, 3, all of Newcastle, Okla., died the day after Christmas along with Jeanine Bonnet, 28, after a space heater set an early morning house fire. Woodfords resident Wes Robbins was living with the children's grandmother while they were born, and said he is their adopted grandfather."They were all born and raised here," he said. "They adopted me. They said …