[Harold] went on a roadtrip with his youngest child, [Robert]. [Robert] watched his son [Ronald] play catch. [Ronald] tossed the ball back and fourth with his brother [Allan]. [Allan] and his sister [Michelle] are going for a walk.
('Harold', 'Michelle')
[Harold] went on a roadtrip with his youngest child, [Robert]. [Robert] watched his son [Ronald] play catch. [Ronald] tossed the ball back and fourth with his brother [Allan]. [Allan] and his sister [Michelle] are going for a walk.
[{('Harold', 'granddaughter', 'Michelle'): [('Harold', 'grandson', 'Ronald'), ('Ronald', 'sister', 'Michelle')]}, {('Ronald', 'sister', 'Michelle'): [('Ronald', 'brother', 'Allan'), ('Allan', 'sister', 'Michelle')]}, {('Harold', 'grandson', 'Ronald'): [('Harold', 'son', 'Robert'), ('Robert', 'son', 'Ronald')]}]
['son', 'son', 'brother', 'sister']