[Frances] took her daughter [Lena] to school during the cold winter morning. [Chris] helped his brother, [Charles], study for the chemistry exam. [Charles] loves his mother [Lena] very much.
('Chris', 'Frances')
[Chris] helped his brother, [Charles], study for the chemistry exam. [Charles] loves his mother [Lena] very much. [Frances] took her daughter [Lena] to school during the cold winter morning.
[{('Chris', 'grandmother', 'Frances'): [('Chris', 'brother', 'Charles'), ('Charles', 'grandmother', 'Frances')]}, {('Charles', 'grandmother', 'Frances'): [('Charles', 'mother', 'Lena'), ('Lena', 'mother', 'Frances')]}]
['brother', 'mother', 'mother']