Method Eases Toil for Mother of Eight Girls -- Having a family of eight girls whose ages range from 12 years to 12 days, is no hardship for Mrs. Kevin Cronin, of Enderley Road, Ascot, as she has a special routine for every day of the week. The girls are Elizabeth (12), Marion (10), Judith (9), Ann (8), Kathryn (6), Denise (5), Joan (2) and Susan (12 days). Mr. and Mrs. Cronin live in a large two-storey house surrounded by lawns and a tennis court ***** there is plenty of room for the children to