[Robert] was on the phone with his sister, [Tracy]. [Tracy] had to put the phone down to open the door for her husband [Antonio], and his son, [Aaron]. [Harold] is taking his son [Robert] out for coffee.
('Harold', 'Aaron')
[Harold] is taking his son [Robert] out for coffee. [Robert] was on the phone with his sister, [Tracy]. [Tracy] had to put the phone down to open the door for her husband [Antonio], and his son, [Aaron].
[{('Harold', 'grandson', 'Aaron'): [('Harold', 'daughter', 'Tracy'), ('Tracy', 'son', 'Aaron')]}, {('Harold', 'daughter', 'Tracy'): [('Harold', 'son', 'Robert'), ('Robert', 'sister', 'Tracy')]}, {('Tracy', 'son', 'Aaron'): [('Tracy', 'husband', 'Antonio'), ('Antonio', 'son', 'Aaron')]}]
['son', 'sister', 'husband', 'son']