[Michael] and his sister [Natalia] went to the ice skating rink. [Michael] fell down and [Natalia] laughed at him. [Ashley] bought a new video game for her grandson [Michael].
('Ashley', 'Natalia')
[Ashley] bought a new video game for her grandson [Michael]. [Michael] and his sister [Natalia] went to the ice skating rink. [Michael] fell down and [Natalia] laughed at him.
[{('Ashley', 'granddaughter', 'Natalia'): [('Ashley', 'grandson', 'Michael'), ('Michael', 'sister', 'Natalia')]}]
['grandson', 'sister']