story: [Rudolph] and his grandmother [Michelle] went water skiing. [Rudolph] had some trouble at first, but [Michelle] taught him how to keep his balance and he soon got pretty good at it. [Sandra] was having dinner with her husband [Rudolph]. [Rudolph] then got a call from his granddaughter [Danita], and her sister [Yvonne].
query: ('Sandra', 'Yvonne')
clean_story: [Sandra] was having dinner with her husband [Rudolph]. [Rudolph] then got a call from his granddaughter [Danita], and her sister [Yvonne].
proof_state: [{('Sandra', 'granddaughter', 'Yvonne'): [('Sandra', 'husband', 'Rudolph'), ('Rudolph', 'granddaughter', 'Yvonne')]}, {('Rudolph', 'granddaughter', 'Yvonne'): [('Rudolph', 'granddaughter', 'Danita'), ('Danita', 'sister', 'Yvonne')]}]