[Cheryl] loves visiting with her aunt [Tracy]. [Tracy] visited her son [Bernardo] at college. [Pedro] went to the beach with his sister [Marie] and his daughter [Cheryl].
('Marie', 'Bernardo')
[Pedro] went to the beach with his sister [Marie] and his daughter [Cheryl]. [Cheryl] loves visiting with her aunt [Tracy]. [Tracy] visited her son [Bernardo] at college.
[{('Marie', 'nephew', 'Bernardo'): [('Marie', 'sister', 'Tracy'), ('Tracy', 'son', 'Bernardo')]}, {('Marie', 'sister', 'Tracy'): [('Marie', 'brother', 'Pedro'), ('Pedro', 'sister', 'Tracy')]}, {('Pedro', 'sister', 'Tracy'): [('Pedro', 'daughter', 'Cheryl'), ('Cheryl', 'aunt', 'Tracy')]}]
['brother', 'daughter', 'aunt', 'son']