[Tracy] took her brother [Pedro] and her daughter [Emma] to the exhibition [Pedro] loves to play baseball with his dad, [Harold]. [Harold] is the proud father of the lovely [Louis]
('Louis', 'Emma')
[Harold] is the proud father of the lovely [Louis] [Pedro] loves to play baseball with his dad, [Harold]. [Tracy] took her brother [Pedro] and her daughter [Emma] to the exhibition
[{('Louis', 'niece', 'Emma'): [('Louis', 'sister', 'Tracy'), ('Tracy', 'daughter', 'Emma')]}, {('Louis', 'sister', 'Tracy'): [('Louis', 'father', 'Harold'), ('Harold', 'daughter', 'Tracy')]}, {('Harold', 'daughter', 'Tracy'): [('Harold', 'son', 'Pedro'), ('Pedro', 'sister', 'Tracy')]}]
['father', 'son', 'sister', 'daughter']