For single mother Dana Hollis, 48, her placement in a 50-unit building in the Bronx with 63 open serious-code violations as of Friday has been a disaster.Eleven of her 12 children are living in the three-bedroom where she was placed. Each sibling in the home — ages 5 to 23 — has a bunk bed, with the girls sharing one room and the boys sharing another. Everybody uses one bathroom.