[Samuel] went fishing with his uncle [Pedro]. [Pedro] bought his daughter, [Rebecca], flowers. [Louis]'s son [Samuel] and sister [Marie] went camping together last weekend.
('Marie', 'Rebecca')
[Louis]'s son [Samuel] and sister [Marie] went camping together last weekend. [Samuel] went fishing with his uncle [Pedro]. [Pedro] bought his daughter, [Rebecca], flowers.
[{('Marie', 'niece', 'Rebecca'): [('Marie', 'brother', 'Pedro'), ('Pedro', 'daughter', 'Rebecca')]}, {('Marie', 'brother', 'Pedro'): [('Marie', 'brother', 'Louis'), ('Louis', 'brother', 'Pedro')]}, {('Louis', 'brother', 'Pedro'): [('Louis', 'son', 'Samuel'), ('Samuel', 'uncle', 'Pedro')]}]
['brother', 'son', 'uncle', 'daughter']