[Mary] bought a nice toy for her grandson [Thomas]. This made [Thomas]'s sister [Gladys] very jealous.
('Gladys', 'Mary')
[Mary] bought a nice toy for her grandson [Thomas]. This made [Thomas]'s sister [Gladys] very jealous.
[{('Gladys', 'grandmother', 'Mary'): [('Gladys', 'brother', 'Thomas'), ('Thomas', 'grandmother', 'Mary')]}]