[Robert] is helping his son study. His name is [Allan]. [Robert] and [Marie] have a daughter named [Michelle], and [Marie] has a son named [John].
('John', 'Allan')
[Robert] and [Marie] have a daughter named [Michelle], and [Marie] has a son named [John]. [Robert] is helping his son study. His name is [Allan].
[{('John', 'brother', 'Allan'): [('John', 'mother', 'Marie'), ('Marie', 'son', 'Allan')]}, {('Marie', 'son', 'Allan'): [('Marie', 'daughter', 'Michelle'), ('Michelle', 'brother', 'Allan')]}, {('Michelle', 'brother', 'Allan'): [('Michelle', 'father', 'Robert'), ('Robert', 'son', 'Allan')]}]
['mother', 'daughter', 'father', 'son']