[Jacob] took his brother [John] to Applebee's for lunch. [John]'s sister [Lois] is on her way there to join them.
('Jacob', 'Lois')
[Jacob] took his brother [John] to Applebee's for lunch. [John]'s sister [Lois] is on her way there to join them.
[{('Jacob', 'sister', 'Lois'): [('Jacob', 'brother', 'John'), ('John', 'sister', 'Lois')]}]