[Cindy] has a lovely sister named [Lena] and [Cindy]'s mother is [Frances] [Frances] is so happy for her son. Her son [Hugh] just joined the Army.
('Hugh', 'Lena')
[Frances] is so happy for her son. Her son [Hugh] just joined the Army. [Cindy] has a lovely sister named [Lena] and [Cindy]'s mother is [Frances]
[{('Hugh', 'sister', 'Lena'): [('Hugh', 'mother', 'Frances'), ('Frances', 'daughter', 'Lena')]}, {('Frances', 'daughter', 'Lena'): [('Frances', 'daughter', 'Cindy'), ('Cindy', 'sister', 'Lena')]}]
['mother', 'daughter', 'sister']