In Guillou's fictional universe, Birger Jarl is the grandson of Arn Magnusson.

Entity and relation annotations:
id: 0
type: entity
value: text: Guillou
labels: <Person>
id: 1
type: entity
value: text: Birger Jarl
labels: <Person>
id: 2
type: entity
value: text: Arn Magnusson
labels: <Person>
type: relation
to_id: 2
labels: Person:family:Person
from_id: 1