[Martha] has been waiting around all day for her son, [Robert]. [Robert] went to a piano concert with his aunt [Stephanie].
('Martha', 'Stephanie')
[Martha] has been waiting around all day for her son, [Robert]. [Robert] went to a piano concert with his aunt [Stephanie].
[{('Martha', 'sister', 'Stephanie'): [('Martha', 'son', 'Robert'), ('Robert', 'aunt', 'Stephanie')]}]