[Douglas] received a nice gift from his grandfather [Clarence]. [Douglas] was so proud he showed it to his mother [Lillian].
('Lillian', 'Clarence')
[Douglas] received a nice gift from his grandfather [Clarence]. [Douglas] was so proud he showed it to his mother [Lillian].
[{('Lillian', 'father', 'Clarence'): [('Lillian', 'son', 'Douglas'), ('Douglas', 'grandfather', 'Clarence')]}]
['son', 'grandfather']