[Elsie] was ill, that's why she could n't go to school. She was with her mother [Robert] all day. [Harold] is taking his daughter [Tracy] out for lunch. [Allan] was going out to dinner with his sister [Elsie] when he received a call from his grandfather [Harold].
('Robert', 'Tracy')
[Elsie] was ill, that's why she could n't go to school. She was with her mother [Robert] all day. [Allan] was going out to dinner with his sister [Elsie] when he received a call from his grandfather [Harold]. [Harold] is taking his daughter [Tracy] out for lunch.
[{('Robert', 'sister', 'Tracy'): [('Robert', 'father', 'Harold'), ('Harold', 'daughter', 'Tracy')]}, {('Robert', 'father', 'Harold'): [('Robert', 'daughter', 'Elsie'), ('Elsie', 'grandfather', 'Harold')]}, {('Elsie', 'grandfather', 'Harold'): [('Elsie', 'brother', 'Allan'), ('Allan', 'grandfather', 'Harold')]}]
['daughter', 'brother', 'grandfather', 'daughter']