[Wesley] and his son [Charles] went to the skating rink. [Wesley] bought a new refrigerator for his mother [Frances]. [Lena] loves to make cookies for her son. His name is [Charles].
('Lena', 'Frances')
[Lena] loves to make cookies for her son. His name is [Charles]. [Wesley] and his son [Charles] went to the skating rink. [Wesley] bought a new refrigerator for his mother [Frances].
[{('Lena', 'mother', 'Frances'): [('Lena', 'son', 'Charles'), ('Charles', 'grandmother', 'Frances')]}, {('Charles', 'grandmother', 'Frances'): [('Charles', 'father', 'Wesley'), ('Wesley', 'mother', 'Frances')]}]
['son', 'father', 'mother']