He is an ancestor of David Cameron, Former Prime Minister of the United Kingdom.

Entity and relation annotations:
id: 0
type: entity
value: text: David Cameron
labels: <Person>
id: 1
type: entity
value: text: Former Prime Minister
labels: <Title>
id: 2
type: entity
value: text: the United Kingdom
labels: <Location>
type: relation
to_id: 1
labels: Person:holds_title:Title
from_id: 0
type: relation
to_id: 2
labels: Person:resides_at:Location
from_id: 0