[Nettie] invited her grandfather [Harold] to the movies last weekend. [Harold] and [Nettie] had a great time together. [Nettie] picked her sister, [Karen], up from the mall. [Karen] called her dad, [Louis], when she got home to let him know where she was. [Robert] played catch with his dad, [Harold]
('Louis', 'Robert')
[Nettie] picked her sister, [Karen], up from the mall. [Karen] called her dad, [Louis], when she got home to let him know where she was. [Nettie] invited her grandfather [Harold] to the movies last weekend. [Harold] and [Nettie] had a great time together. [Robert] played catch with his dad, [Harold]
[{('Louis', 'brother', 'Robert'): [('Louis', 'father', 'Harold'), ('Harold', 'son', 'Robert')]}, {('Louis', 'father', 'Harold'): [('Louis', 'daughter', 'Karen'), ('Karen', 'grandfather', 'Harold')]}, {('Karen', 'grandfather', 'Harold'): [('Karen', 'sister', 'Nettie'), ('Nettie', 'grandfather', 'Harold')]}]
['daughter', 'sister', 'grandfather', 'son']