[Constance]'s sister, [Lois], recently started acting. [Martha] and her sister [Constance] are the only children in their family.
('Lois', 'Martha')
[Constance]'s sister, [Lois], recently started acting. [Martha] and her sister [Constance] are the only children in their family.
[{('Lois', 'sister', 'Martha'): [('Lois', 'sister', 'Constance'), ('Constance', 'sister', 'Martha')]}]