[James] asked his father, [Pedro], to help him with his math homework. [Pedro] could n't, because he was lousy at math himself. [Cheryl] was sewing a sweater for her sister [Rebecca]. [James] and his brother [Jeffrey] had a fight. They did n't speak to each other for a whole week afterwards. [Pedro] and his daughter [Rebecca] are planning a trip to the mountains. They have n't been in almost 10 years.
('Jeffrey', 'Cheryl')
[James] and his brother [Jeffrey] had a fight. They did n't speak to each other for a whole week afterwards. [James] asked his father, [Pedro], to help him with his math homework. [Pedro] could n't, because he was lousy at math himself. [Pedro] and his daughter [Rebecca] are planning a trip to the mountains. They have n't been in almost 10 years. [Cheryl] was sewing a sweater for her sister [Rebecca].
[{('Jeffrey', 'sister', 'Cheryl'): [('Jeffrey', 'sister', 'Rebecca'), ('Rebecca', 'sister', 'Cheryl')]}, {('Jeffrey', 'sister', 'Rebecca'): [('Jeffrey', 'father', 'Pedro'), ('Pedro', 'daughter', 'Rebecca')]}, {('Jeffrey', 'father', 'Pedro'): [('Jeffrey', 'brother', 'James'), ('James', 'father', 'Pedro')]}]
['brother', 'father', 'daughter', 'sister']