[Thomas]'s grandmother [Frances] and his sisters [Andrea] and [Juanita] went on a cruise together.
('Frances', 'Juanita')
[Thomas]'s grandmother [Frances] and his sisters [Andrea] and [Juanita] went on a cruise together.
[{('Frances', 'granddaughter', 'Juanita'): [('Frances', 'grandson', 'Thomas'), ('Thomas', 'sister', 'Juanita')]}, {('Thomas', 'sister', 'Juanita'): [('Thomas', 'sister', 'Andrea'), ('Andrea', 'sister', 'Juanita')]}]
['grandson', 'sister', 'sister']