He is a member of the Kennedy Family through his mother, Eunice Kennedy Shriver.

Entity and relation annotations:
id: 0
type: entity
value: text: Eunice Kennedy Shriver
labels: <Person>
id: 1
type: entity
value: text: the Kennedy Family
labels: <Organization>
type: relation
to_id: 1
labels: Person:belongs_to_NORP:Organization
from_id: 0