[Natalia] called her brother, [Dennis], up to see how he was doing after surgery. [Dennis] loves his mother [Amy] very much.
('Natalia', 'Amy')
[Natalia] called her brother, [Dennis], up to see how he was doing after surgery. [Dennis] loves his mother [Amy] very much.
[{('Natalia', 'mother', 'Amy'): [('Natalia', 'brother', 'Dennis'), ('Dennis', 'mother', 'Amy')]}]
['brother', 'mother']