[Peter] took his daughter [Danita] out for dinner. [Lisa] bought her mother, [Sandra], a puppy for her birthday. [Peter] took his daughter, [Michelle], to a baseball game. [Danita] bought her mother, [Lisa], a puppy for her birthday.
[Peter] took his daughter [Danita] out for dinner. [Danita] bought her mother, [Lisa], a puppy for her birthday. [Lisa] bought her mother, [Sandra], a puppy for her birthday.
[{('Peter', 'mother', 'Sandra'): [('Peter', 'daughter', 'Danita'), ('Danita', 'grandmother', 'Sandra')]}, {('Danita', 'grandmother', 'Sandra'): [('Danita', 'mother', 'Lisa'), ('Lisa', 'mother', 'Sandra')]}]