[Pedro] and his brother [Robert] watch [Pedro]'s daughter [Annie] in her school play. [Annie] asked her mother [Dorothy] if she would take her out for ice cream since it was a warm summer night. [Annie] agreed to do so, but only if they brought some home for [Dorothy]'s brother, [Antonio].
('Robert', 'Antonio')
[Pedro] and his brother [Robert] watch [Pedro]'s daughter [Annie] in her school play. [Annie] asked her mother [Dorothy] if she would take her out for ice cream since it was a warm summer night. [Annie] agreed to do so, but only if they brought some home for [Dorothy]'s brother, [Antonio].
[{('Robert', 'brother', 'Antonio'): [('Robert', 'brother', 'Pedro'), ('Pedro', 'brother', 'Antonio')]}, {('Pedro', 'brother', 'Antonio'): [('Pedro', 'daughter', 'Annie'), ('Annie', 'uncle', 'Antonio')]}, {('Annie', 'uncle', 'Antonio'): [('Annie', 'mother', 'Dorothy'), ('Dorothy', 'brother', 'Antonio')]}]
['brother', 'daughter', 'mother', 'brother']