[Mary] called her daughter [Lois] to ask her to do her a favor. [Lois] was n't available so she called [Lois]'s sister [Martha] who answered right away.
('Martha', 'Mary')
[Mary] called her daughter [Lois] to ask her to do her a favor. [Lois] was n't available so she called [Lois]'s sister [Martha] who answered right away.
[{('Martha', 'mother', 'Mary'): [('Martha', 'sister', 'Lois'), ('Lois', 'mother', 'Mary')]}]