[Rich] took his sister [Katherine] out to dinner for her birthday. [Keith] went on a camping trip with his father [Rich] and grandfather [Scott] last weekend.
('Katherine', 'Scott')
[Rich] took his sister [Katherine] out to dinner for her birthday. [Keith] went on a camping trip with his father [Rich] and grandfather [Scott] last weekend.
[{('Katherine', 'father', 'Scott'): [('Katherine', 'brother', 'Rich'), ('Rich', 'father', 'Scott')]}, {('Rich', 'father', 'Scott'): [('Rich', 'son', 'Keith'), ('Keith', 'grandfather', 'Scott')]}]