[Bobby] and his sister [Gloria] were playing chess. Meanwhile, [Gloria]'s grandmother, [Frances], and [Hugh]'s son, [Bobby], were playing checkers.
('Hugh', 'Frances')
[Bobby] and his sister [Gloria] were playing chess. Meanwhile, [Gloria]'s grandmother, [Frances], and [Hugh]'s son, [Bobby], were playing checkers.
[{('Hugh', 'mother', 'Frances'): [('Hugh', 'daughter', 'Gloria'), ('Gloria', 'grandmother', 'Frances')]}, {('Hugh', 'daughter', 'Gloria'): [('Hugh', 'son', 'Bobby'), ('Bobby', 'sister', 'Gloria')]}]
['son', 'sister', 'grandmother']