Nogai's father Tatar died when he was serving under Hulegu.

Entity and relation annotations:
id: 0
type: entity
value: text: Nogai
labels: <Person>
id: 1
type: entity
value: text: Tatar
labels: <Person>
id: 2
type: entity
value: text: Hulegu
labels: <Person>
type: relation
to_id: 1
labels: Person:family:Person
from_id: 0