[Frances] had to pick up her grandson [Irvin] and his sister, [Pamela], from school today. [Mildred] and her sister [Pamela] played golf together. [Mildred] won easily.
('Frances', 'Mildred')
[Frances] had to pick up her grandson [Irvin] and his sister, [Pamela], from school today. [Mildred] and her sister [Pamela] played golf together. [Mildred] won easily.
[{('Frances', 'granddaughter', 'Mildred'): [('Frances', 'grandson', 'Irvin'), ('Irvin', 'sister', 'Mildred')]}, {('Irvin', 'sister', 'Mildred'): [('Irvin', 'sister', 'Pamela'), ('Pamela', 'sister', 'Mildred')]}]
['grandson', 'sister', 'sister']