[Hugh]'s two daughters [Marie] and [Vanetta] are eating lunch with [Marie]'s mother [David].
('Vanetta', 'David')
[Hugh]'s two daughters [Marie] and [Vanetta] are eating lunch with [Marie]'s mother [David].
[{('Vanetta', 'mother', 'David'): [('Vanetta', 'sister', 'Marie'), ('Marie', 'mother', 'David')]}, {('Vanetta', 'sister', 'Marie'): [('Vanetta', 'father', 'Hugh'), ('Hugh', 'daughter', 'Marie')]}]
['father', 'daughter', 'mother']