[Cindy] took her son [Leonard] to school and his grandfather [James] picked him up at then end of the school day. [Pete]'s mother, [Cindy], was calling him for dinner.
('Pete', 'James')
[Pete]'s mother, [Cindy], was calling him for dinner. [Cindy] took her son [Leonard] to school and his grandfather [James] picked him up at then end of the school day.
[{('Pete', 'grandfather', 'James'): [('Pete', 'mother', 'Cindy'), ('Cindy', 'father', 'James')]}, {('Cindy', 'father', 'James'): [('Cindy', 'son', 'Leonard'), ('Leonard', 'grandfather', 'James')]}]
['mother', 'son', 'grandfather']