[Milton]'s father's name is [Nicholas]. [Nicholas] and his father [Clarence] went jogging by the lake.
('Clarence', 'Milton')
[Nicholas] and his father [Clarence] went jogging by the lake. [Milton]'s father's name is [Nicholas].
[{('Clarence', 'grandson', 'Milton'): [('Clarence', 'son', 'Nicholas'), ('Nicholas', 'son', 'Milton')]}]
['son', 'son']