[Dorothy] picked up her brother [Louis] from the airport. Then they went to her sister [Tracy]'s house for lunch. [Marie] made sure that her sister [Tracy] would be able to make it to the restaurant on Saturday. [Marie] was excited to have her son [Mario] spend some time with [Tracy].
('Louis', 'Mario')
[Dorothy] picked up her brother [Louis] from the airport. Then they went to her sister [Tracy]'s house for lunch. [Marie] made sure that her sister [Tracy] would be able to make it to the restaurant on Saturday. [Marie] was excited to have her son [Mario] spend some time with [Tracy].
[{('Louis', 'nephew', 'Mario'): [('Louis', 'sister', 'Marie'), ('Marie', 'son', 'Mario')]}, {('Louis', 'sister', 'Marie'): [('Louis', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Marie')]}, {('Dorothy', 'sister', 'Marie'): [('Dorothy', 'sister', 'Tracy'), ('Tracy', 'sister', 'Marie')]}]
['sister', 'sister', 'sister', 'son']