story: [Mark] and [Carol] got married last fall. After 1 year of marriage, [Carol] gave birth to her first child [David]. [David] met his brother [Michael] for drinks after work. [Sandra] was glad to see her grandson, [David].
query: ('Mark', 'Sandra')
clean_story: [Mark] and [Carol] got married last fall. After 1 year of marriage, [Carol] gave birth to her first child [David]. [Sandra] was glad to see her grandson, [David].
proof_state: [{('Mark', 'mother-in-law', 'Sandra'): [('Mark', 'wife', 'Carol'), ('Carol', 'mother', 'Sandra')]}, {('Carol', 'mother', 'Sandra'): [('Carol', 'son', 'David'), ('David', 'grandmother', 'Sandra')]}]