President Kennedy’s great-grandparents immigrated to the United States from Ireland in 1858. They settled in Boston, Massachusetts. His grandfathers, Patrick J. Kennedy and John F. Fitzgerald, were born there. Both men became influential in state politics. Honey Fitz served several terms as Boston’s mayor and as a member of the United States House of Representatives. Patrick Kennedy was a powerful ward boss and served in both houses of the Massachusetts legislature. Patrick’s son, Joseph, was a brilliant mathematician. At the age of 25, he became the youngest bank president in the United States. Joseph married Rose Fitzgerald, daughter of Honey Fitz, on October 7, 1914. Their first child, Joseph, Jr., was born in 1915. John was born on May 29, 1917. Seven other children followed: Rosemary, Kathleen, Eunice, Patricia, Robert, Jean, and Edward. All were born in Brookline, Massachusetts, a suburb of Boston.

Source: Britannica Kids