[Robert] liked to talk about his sister, [Dorothy]. [Dorothy] wants to make a special meal for her daughter [Heather]'s birthday. [Robert] is the great brother of [Louis]. [Cheryl]'s sister, [Heather], recently started acting.
('Louis', 'Cheryl')
[Robert] is the great brother of [Louis]. [Robert] liked to talk about his sister, [Dorothy]. [Dorothy] wants to make a special meal for her daughter [Heather]'s birthday. [Cheryl]'s sister, [Heather], recently started acting.
[{('Louis', 'niece', 'Cheryl'): [('Louis', 'sister', 'Dorothy'), ('Dorothy', 'daughter', 'Cheryl')]}, {('Louis', 'sister', 'Dorothy'): [('Louis', 'brother', 'Robert'), ('Robert', 'sister', 'Dorothy')]}, {('Dorothy', 'daughter', 'Cheryl'): [('Dorothy', 'daughter', 'Heather'), ('Heather', 'sister', 'Cheryl')]}]
['brother', 'sister', 'daughter', 'sister']