[Cheryl] made breakfast for her sister [Rebecca]. [Rebecca]'s brother [James] sat down at the table with a bowl of cereal. [Harold] picked up his granddaughter, [Rebecca], from gymnastics. [Rebecca] went on a vacation with her brother [James].
('Harold', 'Cheryl')
[Harold] picked up his granddaughter, [Rebecca], from gymnastics. [Rebecca] went on a vacation with her brother [James]. [Cheryl] made breakfast for her sister [Rebecca]. [Rebecca]'s brother [James] sat down at the table with a bowl of cereal.
[{('Harold', 'granddaughter', 'Cheryl'): [('Harold', 'grandson', 'James'), ('James', 'sister', 'Cheryl')]}, {('James', 'sister', 'Cheryl'): [('James', 'sister', 'Rebecca'), ('Rebecca', 'sister', 'Cheryl')]}, {('Harold', 'grandson', 'James'): [('Harold', 'granddaughter', 'Rebecca'), ('Rebecca', 'brother', 'James')]}]
['granddaughter', 'brother', 'sister', 'sister']