[Joshua] and his wife [Lynn] and their son [Clarence] to visit [Clarence]'s grandfather [James] on Sunday because it was his birthday.
('Lynn', 'James')
[Joshua] and his wife [Lynn] and their son [Clarence] to visit [Clarence]'s grandfather [James] on Sunday because it was his birthday.
[{('Lynn', 'father', 'James'): [('Lynn', 'son', 'Clarence'), ('Clarence', 'grandfather', 'James')]}, {('Lynn', 'son', 'Clarence'): [('Lynn', 'husband', 'Joshua'), ('Joshua', 'son', 'Clarence')]}]
['husband', 'son', 'grandfather']