[Lena] and her son [Chris] went to the zoo with [Lena]'s brother [Francisco]. [Francisco] and [Joshua] are brothers. they like to spend time together
('Joshua', 'Chris')
[Francisco] and [Joshua] are brothers. they like to spend time together [Lena] and her son [Chris] went to the zoo with [Lena]'s brother [Francisco].
[{('Joshua', 'nephew', 'Chris'): [('Joshua', 'sister', 'Lena'), ('Lena', 'son', 'Chris')]}, {('Joshua', 'sister', 'Lena'): [('Joshua', 'brother', 'Francisco'), ('Francisco', 'sister', 'Lena')]}]
['brother', 'sister', 'son']