[Douglas]'s mother [Lillian] wanted to surprise him for his birthday, so she baked him a cake. [Lillian]'s son called [John] is good and intelligent boy
('Douglas', 'John')
[Douglas]'s mother [Lillian] wanted to surprise him for his birthday, so she baked him a cake. [Lillian]'s son called [John] is good and intelligent boy
[{('Douglas', 'brother', 'John'): [('Douglas', 'mother', 'Lillian'), ('Lillian', 'son', 'John')]}]
['mother', 'son']