[Cindy] was upset because her husband, [Francisco], did n't buy her flowers for their wedding anniversary. [Richard]'s mother [Cindy] was present at the thanksgiving service. [Francisco] went to pick up his son [Pete] from the baseball practice.
('Richard', 'Pete')
[Richard]'s mother [Cindy] was present at the thanksgiving service. [Cindy] was upset because her husband, [Francisco], did n't buy her flowers for their wedding anniversary. [Francisco] went to pick up his son [Pete] from the baseball practice.
[{('Richard', 'brother', 'Pete'): [('Richard', 'mother', 'Cindy'), ('Cindy', 'son', 'Pete')]}, {('Cindy', 'son', 'Pete'): [('Cindy', 'husband', 'Francisco'), ('Francisco', 'son', 'Pete')]}]
['mother', 'husband', 'son']