Ernest Morrow aka Ernie is a student at Pencey and the daughter of Mrs. Morrow.
According to Holden, Ernest goes down the corridor at Pencey often and snaps his wet towel at people's asses. However Ernest's mother describes her son as a very sensitive boy that has trouble mixing with other boys and probably takes things more seriously than kids should at his age.
Ernie lives in a house on the beach of Gloucester, Massachusetts. His family, being very wealthy, has a Tennis Court at their estate (pg. 58, ch.8)