[Roy] is coaching his daughter [Martha]'s softball team this summer. [Martha] was playing in the sandbox with her brother [Ernest].
('Roy', 'Ernest')
[Roy] is coaching his daughter [Martha]'s softball team this summer. [Martha] was playing in the sandbox with her brother [Ernest].
[{('Roy', 'son', 'Ernest'): [('Roy', 'daughter', 'Martha'), ('Martha', 'brother', 'Ernest')]}]