[Michael] took his mother, [David], and his sister, [Marie], to the store. [Brandon] took his wife [Marie] out on a date last weekend.
('Brandon', 'David')
[Brandon] took his wife [Marie] out on a date last weekend. [Michael] took his mother, [David], and his sister, [Marie], to the store.
[{('Brandon', 'mother-in-law', 'David'): [('Brandon', 'wife', 'Marie'), ('Marie', 'mother', 'David')]}, {('Marie', 'mother', 'David'): [('Marie', 'brother', 'Michael'), ('Michael', 'mother', 'David')]}]
['wife', 'brother', 'mother']