[Tom] asked his father, [Rich] to help him build a birdhouse. [Katherine]'s son, [Bret], recently started a pawn shop. [Katherine] and her nephew [Tom] went to the store to buy some new tea.
('Rich', 'Bret')
[Tom] asked his father, [Rich] to help him build a birdhouse. [Katherine] and her nephew [Tom] went to the store to buy some new tea. [Katherine]'s son, [Bret], recently started a pawn shop.
[{('Rich', 'nephew', 'Bret'): [('Rich', 'sister', 'Katherine'), ('Katherine', 'son', 'Bret')]}, {('Rich', 'sister', 'Katherine'): [('Rich', 'son', 'Tom'), ('Tom', 'aunt', 'Katherine')]}]