[Amy] went to the grocery store to get a snack for her son [Dennis]. While there, [Amy]'s daughter, [Mary], called and asked her to get milk too.
('Mary', 'Dennis')
[Amy] went to the grocery store to get a snack for her son [Dennis]. While there, [Amy]'s daughter, [Mary], called and asked her to get milk too.
[{('Mary', 'brother', 'Dennis'): [('Mary', 'mother', 'Amy'), ('Amy', 'son', 'Dennis')]}]
['mother', 'son']