[Francisco] brought his mother [Frances] as a guest to the Christmas party. [Lena], [Francisco]'s sister, came as a guest of his friend. [Lena] could n't wait to get off the plane to see her mother, [Tina].
('Tina', 'Frances')
[Lena] could n't wait to get off the plane to see her mother, [Tina]. [Francisco] brought his mother [Frances] as a guest to the Christmas party. [Lena], [Francisco]'s sister, came as a guest of his friend.
[{('Tina', 'grandmother', 'Frances'): [('Tina', 'mother', 'Lena'), ('Lena', 'mother', 'Frances')]}, {('Lena', 'mother', 'Frances'): [('Lena', 'brother', 'Francisco'), ('Francisco', 'mother', 'Frances')]}]
['mother', 'brother', 'mother']