[Nicholas] asked his father, [Clarence], to help him with his math homework. [Clarence] could n't, because he was lousy at math himself. [Nicholas] took his daughter [Emily] to softball practie.
('Emily', 'Clarence')
[Nicholas] took his daughter [Emily] to softball practie. [Nicholas] asked his father, [Clarence], to help him with his math homework. [Clarence] could n't, because he was lousy at math himself.
[{('Emily', 'grandfather', 'Clarence'): [('Emily', 'father', 'Nicholas'), ('Nicholas', 'father', 'Clarence')]}]
['father', 'father']