OBERLIN, Ohio (AP) — Seven children were burned to death Sunday night in a flash fire which ripped through two bedrooms at the rear of a one-story frame home on the south side of this college town. Fire department officials said the flames were fed by oil from a faulty heater. Two four-year-old boys and three adults escaped unharmed. The adults, Lucille Isom, 24, and Mary Malone, 20, sisters, were with their mother, Sylvia Malone, in the front part of the seven room home.