[Joshua] went to pick up his son [Clarence] from the baseball practice. [James] is an engineer who loves to take his son [Joshua] to the science museum to help him learn about the world [James] and his wife [Frances] are going to be at the play.
('Frances', 'Clarence')
[James] and his wife [Frances] are going to be at the play. [James] is an engineer who loves to take his son [Joshua] to the science museum to help him learn about the world [Joshua] went to pick up his son [Clarence] from the baseball practice.
[{('Frances', 'grandson', 'Clarence'): [('Frances', 'husband', 'James'), ('James', 'grandson', 'Clarence')]}, {('James', 'grandson', 'Clarence'): [('James', 'son', 'Joshua'), ('Joshua', 'son', 'Clarence')]}]
['husband', 'son', 'son']