[John] and his wife [Angelica] went rock-climbing this weekend. [Elsie]'s sister [Michelle] and father [Robert] put on a movie for them all to watch, while [Michelle]'s sister [Angelica] napped in bed.
('John', 'Robert')
[John] and his wife [Angelica] went rock-climbing this weekend. [Elsie]'s sister [Michelle] and father [Robert] put on a movie for them all to watch, while [Michelle]'s sister [Angelica] napped in bed.
[{('John', 'father-in-law', 'Robert'): [('John', 'wife', 'Angelica'), ('Angelica', 'father', 'Robert')]}, {('Angelica', 'father', 'Robert'): [('Angelica', 'sister', 'Michelle'), ('Michelle', 'father', 'Robert')]}, {('Michelle', 'father', 'Robert'): [('Michelle', 'sister', 'Elsie'), ('Elsie', 'father', 'Robert')]}]
['wife', 'sister', 'sister', 'father']