[Louis] and his sister [Dorothy] went to the ice skating rink. [Louis] fell down and [Dorothy] laughed at him. [Louis] was busy planning a camping trip with his daughter [Nettie]. [Tracy] visited her brother [Robert] in New York. His sister [Dorothy] was there too.
('Nettie', 'Tracy')
[Louis] was busy planning a camping trip with his daughter [Nettie]. [Louis] and his sister [Dorothy] went to the ice skating rink. [Louis] fell down and [Dorothy] laughed at him. [Tracy] visited her brother [Robert] in New York. His sister [Dorothy] was there too.
[{('Nettie', 'aunt', 'Tracy'): [('Nettie', 'father', 'Louis'), ('Louis', 'sister', 'Tracy')]}, {('Louis', 'sister', 'Tracy'): [('Louis', 'brother', 'Robert'), ('Robert', 'sister', 'Tracy')]}, {('Louis', 'brother', 'Robert'): [('Louis', 'sister', 'Dorothy'), ('Dorothy', 'brother', 'Robert')]}]
['father', 'sister', 'brother', 'sister']