[Chris] and his sister [Martha] along with their mother [Lena] and her mom [Frances] all went on a cruise together.
('Chris', 'Frances')
[Chris] and his sister [Martha] along with their mother [Lena] and her mom [Frances] all went on a cruise together.
[{('Chris', 'grandmother', 'Frances'): [('Chris', 'sister', 'Martha'), ('Martha', 'grandmother', 'Frances')]}, {('Martha', 'grandmother', 'Frances'): [('Martha', 'mother', 'Lena'), ('Lena', 'mother', 'Frances')]}]
['sister', 'mother', 'mother']