[John] asked his sister, [Lois], if she would babysit his son, [Robert], for the night.
('Robert', 'Lois')
[John] asked his sister, [Lois], if she would babysit his son, [Robert], for the night.
[{('Robert', 'aunt', 'Lois'): [('Robert', 'father', 'John'), ('John', 'sister', 'Lois')]}]