Based on this paragraph, how many younger siblings did Kennedy have?

Kennedy was born on February 22, 1932, at St. Margaret's Hospital in the Dorchester section of Boston, Massachusetts.[1] He was the youngest of the nine children of Joseph Patrick Kennedy and Rose Fitzgerald, members of prominent Irish American families in Boston.[1] They constituted one of the wealthiest families in the nation after their marriage.[2] His eight siblings were Joseph Jr., John, Rosemary, Kathleen, Eunice, Patricia, Robert, and Jean. His older brother John asked to be the newborn's godfather, a request his parents honored, though they did not agree to his request to name the baby George Washington Kennedy (Ted was born on President George Washington's 200th birthday). They named the boy after their father's assistant.[3]

Based on this paragraph, Kennedy had no younger siblings, as he was the youngest of nine children.