Twins become mothers together for second time in less than two years. Washington, D.C., April 7. Accustomed to doing practically the same things all their lives, these Washington twins, now mothers, have apparently decided that having their children together would certainly be in order. The mothers, Mrs. Eileen Moon, left, and Mrs. Kathleen Robie, last week gave birth to daughters to set a new record at Columbia Maternity Hospital. Mrs. Moon's youngster, whom she named Carol, was born on March 29, while Mrs. Robie's new daughter Nancy Lee first saw the light of day on April 1. This same thing happened in July 1937 when Mrs. Robie gave birth to a girl and a few hours later Mrs. Moon's baby, a boy, arrived