[Lizzie] and her brother [Ronald] watched TV together. [Mario] was invited to watch too, because [Lizzie] is his sister. [Mario] and his father [Robert] went jogging by the lake. [Robert] played catch with his dad, [Harold]
('Harold', 'Ronald')
[Robert] played catch with his dad, [Harold] [Mario] and his father [Robert] went jogging by the lake. [Lizzie] and her brother [Ronald] watched TV together. [Mario] was invited to watch too, because [Lizzie] is his sister.
[{('Harold', 'grandson', 'Ronald'): [('Harold', 'granddaughter', 'Lizzie'), ('Lizzie', 'brother', 'Ronald')]}, {('Harold', 'granddaughter', 'Lizzie'): [('Harold', 'son', 'Robert'), ('Robert', 'daughter', 'Lizzie')]}, {('Robert', 'daughter', 'Lizzie'): [('Robert', 'son', 'Mario'), ('Mario', 'sister', 'Lizzie')]}]
['son', 'son', 'sister', 'brother']