[Erika] and her mother [Tracy] visited her grandfather [Harold] [Tracy] took her daughter, [Laura], to lunch. [Harold] was delighted to watch his son [Robert] steal third base in the Championship baseball game.
('Laura', 'Robert')
[Tracy] took her daughter, [Laura], to lunch. [Erika] and her mother [Tracy] visited her grandfather [Harold] [Harold] was delighted to watch his son [Robert] steal third base in the Championship baseball game.
[{('Laura', 'uncle', 'Robert'): [('Laura', 'mother', 'Tracy'), ('Tracy', 'brother', 'Robert')]}, {('Tracy', 'brother', 'Robert'): [('Tracy', 'father', 'Harold'), ('Harold', 'son', 'Robert')]}, {('Tracy', 'father', 'Harold'): [('Tracy', 'daughter', 'Erika'), ('Erika', 'grandfather', 'Harold')]}]
['mother', 'daughter', 'grandfather', 'son']