[Joshua] and his son [Thomas] went to the skating rink. [Lynn] took her son [Thomas] to school this morning because he missed the bus. [Joshua] and his sister [David] got their mother [David] a new computer for her birthday. She really liked it.
('Lynn', 'David')
[Lynn] took her son [Thomas] to school this morning because he missed the bus. [Joshua] and his son [Thomas] went to the skating rink. [Joshua] and his sister [David] got their mother [David] a new computer for her birthday. She really liked it.
[{('Lynn', 'sister', 'David'): [('Lynn', 'son', 'Thomas'), ('Thomas', 'aunt', 'David')]}, {('Thomas', 'aunt', 'David'): [('Thomas', 'father', 'Joshua'), ('Joshua', 'sister', 'David')]}]
['son', 'father', 'sister']