WINONA, Minn. — Two teen-age brothers got into a drag-down fight at home, their mother and sister then being injured when they intervened to break it up. Such was what police decided had happened after arriving about 4:10 p.m. Officers said the mother, age 39, and the sister, 14, had been punched. Neither asked for medical assistance. This was in the 200 block of West Sarnia Street. The boys, 17 and 15, were arrested and charged with domestic assault. The 15-year-old had a minor face cut, police said.