[Nicholas] played board games with his son [Glen]. [Lillian] asked [Nicholas], her brother, if she could join.
('Lillian', 'Glen')
[Nicholas] played board games with his son [Glen]. [Lillian] asked [Nicholas], her brother, if she could join.
[{('Lillian', 'nephew', 'Glen'): [('Lillian', 'brother', 'Nicholas'), ('Nicholas', 'son', 'Glen')]}]
['brother', 'son']