[Michael]'s sister [Marie] asked him for some help planting her garden. [David] and [Lynn] took [David]'s daughter [Marie] to their family's land in Germany for a summer vacation.
('Lynn', 'Michael')
[David] and [Lynn] took [David]'s daughter [Marie] to their family's land in Germany for a summer vacation. [Michael]'s sister [Marie] asked him for some help planting her garden.
[{('Lynn', 'nephew', 'Michael'): [('Lynn', 'sister', 'David'), ('David', 'son', 'Michael')]}, {('David', 'son', 'Michael'): [('David', 'daughter', 'Marie'), ('Marie', 'brother', 'Michael')]}]
['sister', 'daughter', 'brother']