[Dennis] and his father [Nicholas] went jogging by the lake. [Dennis] has a brother who is younger than him. The brother has a sister whose name is [Mary].
('Nicholas', 'Mary')
[Dennis] and his father [Nicholas] went jogging by the lake. [Dennis] has a brother who is younger than him. The brother has a sister whose name is [Mary].
[{('Nicholas', 'daughter', 'Mary'): [('Nicholas', 'son', 'Dennis'), ('Dennis', 'sister', 'Mary')]}]
['son', 'sister']