[Ashley] decided she would like to invite her son [Nicholas], as well as [Nicholas]'s son [Dennis], to the park for a picnic.
('Dennis', 'Ashley')
[Ashley] decided she would like to invite her son [Nicholas], as well as [Nicholas]'s son [Dennis], to the park for a picnic.
[{('Dennis', 'grandmother', 'Ashley'): [('Dennis', 'father', 'Nicholas'), ('Nicholas', 'mother', 'Ashley')]}]
['father', 'mother']