The New Orleans teachers' union and a lawyer for several local families have sued to force the opening of more public schools in the storm-ravaged city, but state education officials contend that enough space is available at the schools already operating. ...] Asta Levene, whose 10-year-old son Angelo attended McDonough #15 Elementary School in the French Quarter before the storm, said she tried, and failed, to enroll him in any of the reopened public elementary schools.