[Charles] and her sister [Martha] decided to take a trip to Mexico together. [James] went to his daughter [Lena]'s house, to have lunch with her son [Charles].
('Martha', 'James')
[Charles] and her sister [Martha] decided to take a trip to Mexico together. [James] went to his daughter [Lena]'s house, to have lunch with her son [Charles].
[{('Martha', 'grandfather', 'James'): [('Martha', 'brother', 'Charles'), ('Charles', 'grandfather', 'James')]}, {('Charles', 'grandfather', 'James'): [('Charles', 'mother', 'Lena'), ('Lena', 'father', 'James')]}]
['brother', 'mother', 'father']